Four Days Late and Freaking Out? I’ve Been There. Here’s What I Learned About Why Your Period Is Really “Late.”

The clock ticks differently when you’re waiting for your period.

A day feels like a week.

Four days can feel like an eternity.

I know that feeling intimately.

The subtle calendar-checking that becomes obsessive.

The mental gymnastics of counting days, re-counting them, and then questioning your own memory.

The hyper-awareness of every twinge and flutter in your abdomen, each one a potential clue in a mystery you desperately need to solve.

And, of course, the anxiety—a cold, creeping dread that starts in your stomach and quickly floods your mind with a cascade of worst-case scenarios.¹

I’ve spent nights scrolling through forums, reading stories from others who were also lost in that limbo, their words mirroring my own panic: “My period is 4 days late and I’m stressing out!” “I’ve been more than 4 days late before but not pregnant.” “The weeks kept getting longer and longer and I kept thinking it was the end of my life for sure”.²

This feeling is profoundly normal.

It’s the uncertainty that gets you—the sense that your own body, this vessel you thought you knew, has suddenly gone off-script, leaving you feeling powerless and alarmed.⁶

My journey through that particular brand of panic didn’t just end with my period finally arriving.

It forced me to question everything I thought I knew about my cycle.

It led me down a rabbit hole of research that ultimately resulted in a profound epiphany—a complete shift in how I view my body.

I realized I was working with a flawed mental model, one that was causing my anxiety.

This article is the guide I wish I’d had during those longest four days of my life.

It’s not just a list of reasons your period might be late; it’s an invitation to a new way of understanding your body—not as a faulty machine, but as an intelligent, responsive system that is constantly communicating with you.

Part I: The First Question – Let’s Get It Out of the Way

Before we can explore anything else, we have to address the elephant in the room.

For many of us, the first thought that screams through the panic is: “Am I pregnant?”.¹

It’s the most immediate and often the most life-altering possibility, so let’s tackle it head-on to clear the mental space for everything else.

A Clear, Calm Guide to Pregnancy Tests

The anxiety of not knowing can be paralyzing, but taking a test is an empowering step toward clarity.

Here’s what you need to know:

• How They Work: Home pregnancy tests are designed to detect a specific hormone called human chorionic gonadotropin (hCG) in your urine.¹⁰ Your body starts producing hCG only after a fertilized egg has implanted in the uterine wall.
• When to Test: The best time to take a test is after your period is officially late. While some tests claim they can detect pregnancy a few days before a missed period, you risk getting a false negative if your hCG levels haven’t risen enough yet. Testing too early can lead to more confusion and anxiety. A period is generally considered late if it’s more than five to seven days past its expected arrival date.¹¹
• Interpreting the Result: Follow the instructions on the package carefully. A positive result is almost certainly accurate. A negative result is reliable, especially if your period is more than a week late, but if you tested early, you might consider retesting in a few days if your period still hasn’t arrived. Regardless of the result, if you have concerns, the next step is to follow up with a healthcare provider.
• The Emotional Rollercoaster: Be prepared for a wave of emotions, no matter what the test says. You might feel overwhelming relief, profound disappointment, or a confusing mixture of both. One person on a forum shared the disorienting experience of being terrified of a positive test, only to feel “completely devastated” when it was negative.¹ Your feelings are valid, whatever they are.

Getting a clear answer to the pregnancy question is a critical first step.

It allows you to move out of the realm of panicked speculation and into a space where you can calmly and curiously explore what else your body might be telling you.

Part II: My Epiphany: Your Body Isn’t a Broken Clock, It’s a Responsive Ecosystem

For years, I operated under a simple but stressful assumption: my menstrual cycle was a machine, a perfect 28-day clock.

Every month, it was supposed to tick along predictably.

If it was early or late, the clock was “broken.” This mechanical view, which is common in our culture, frames the body as something that can malfunction, like a faulty piece of manufacturing equipment.¹³

It sets us up for an adversarial relationship with our own physiology, reinforcing the myth that a “normal” cycle must be

exactly 28 days long, when in reality, a normal range for adults is anywhere from 21 to 35 days.¹¹

My epiphany came when I finally let go of that flawed paradigm.

I realized my body isn’t a machine at all.

It’s an ecosystem.

Think of your menstrual cycle as a complex, dynamic ecosystem, like a coastal estuary or a dense forest.

This ecosystem is not rigid; its defining characteristic is its ability to respond and adapt to its environment.

Its rhythms are influenced by the “weather,” the “climate,” the “soil quality,” and any “foreign elements” introduced into it.

This simple shift in perspective changes everything.

A “late” period is no longer a failure or a malfunction.

It’s a signal.

It’s your ecosystem communicating that it is intelligently responding to a change in its internal or external environment.

This reframes the cycle as a “vital sign” of your overall health, a concept that promotes “body literacy”—the ability to listen to and understand the messages your body is sending.¹³

This idea is even echoed in grand scientific theories like the Gaia hypothesis, which proposes that the Earth itself is a synergistic, self-regulating system of living and non-living things working together to maintain the conditions for life.¹⁶

We are, each of us, a personal, biological Gaia.

When you see your body as an ecosystem, you move from being a frustrated mechanic trying to fix a broken clock to a curious and compassionate ecologist, observing the signs and asking, “What is my body responding to?” instead of “What is wrong with me?”

Part III: The Ecosystem’s Climate Control: Your Hormonal Command Center

To be a good steward of your ecosystem, you first need to understand how it works.

The menstrual cycle is driven by a beautiful and complex hormonal cascade—a conversation between your brain and your ovaries.

Think of it as your ecosystem’s internal “climate control system.”

• The Command Center (The Brain): Deep in your brain, the hypothalamus and pituitary gland act as the master control center. The hypothalamus sends out the “master forecast” in the form of gonadotropin-releasing hormone (GnRH).¹⁷ This forecast tells the pituitary gland what to do next.
• The Hormonal “Weather” (The Ovarian and Uterine Cycles): The pituitary gland responds by releasing two key hormones that create the “weather” for your cycle, which unfolds in two parallel stories: one in the ovaries (the ovarian cycle) and one in the uterus (the uterine cycle).¹⁸

1. Follicular Phase (The Inner Spring): This phase starts on the first day of your period. The pituitary releases follicle-stimulating hormone (FSH), which is like a gentle spring rain that encourages a group of follicles (sacs containing immature eggs) in your ovaries to grow.¹⁰ As one follicle becomes dominant, it starts producing
   estrogen. Estrogen is like the warm sunlight of late spring; it causes the lining of your uterus (the endometrium, or the “soil”) to thicken and prepare for a potential pregnancy.¹⁰
2. Ovulation (The Summer Solstice): When estrogen levels reach a high peak, it triggers a dramatic surge of a third hormone from the pituitary: luteinizing hormone (LH).¹⁰ This LH surge is the peak of summer, the main event. About 28 to 36 hours after it begins, it causes the dominant follicle to rupture and release its mature egg. This is ovulation.¹⁷
3. Luteal Phase (The Autumn Harvest): After releasing the egg, the ruptured follicle transforms into a structure called the corpus luteum. It now becomes a factory for progesterone, the quintessential “autumn” hormone.¹⁰ Progesterone makes the uterine lining even more rich, stable, and nourishing—the perfect bed for a fertilized egg to implant.
4. Menstruation (The Winter Reset): If the egg isn’t fertilized and no pregnancy occurs, the corpus luteum breaks down. As it does, levels of both estrogen and progesterone plummet.¹⁰ This sharp drop in hormones is the signal for the uterus to shed its lining. This shedding is your period, and it marks Day 1 of a brand new cycle, a return to winter, ready for the next spring.

Understanding this sequence is crucial.

Ovulation is the pivotal event.

Your period reliably arrives about 14 days after you ovulate.²⁰

Therefore, if your period is late, it almost always means that

ovulation was late.

The question shifts from “Why isn’t my period starting?” to the more accurate and insightful question, “What might have delayed my ovulation this month?”

Part IV: Environmental Pressures: The Top 3 Reasons Your Ecosystem Is Adapting

With our new understanding, we can see that a late period is often the result of temporary “environmental pressures” that cause the ecosystem to intelligently delay ovulation.

Here are the most common ones.

1. The Drought of Chronic Stress

We all know stress feels bad, but its physical effects are profound.

Think of chronic stress—from work pressure, relationship turmoil, financial worries, or a major life event—as a prolonged drought in your ecosystem.⁶

• The Biology: Your body has a dedicated stress-response system called the hypothalamic-pituitary-adrenal (HPA) axis.²³ When you perceive a threat, your brain’s command center (the hypothalamus) sounds the alarm, leading to the release of
  cortisol, the primary stress hormone.¹²
• The Disruption: Cortisol is the “drought hormone.” Its job is to mobilize energy for immediate survival. High, sustained levels of cortisol send a powerful message back to the command center: “This is not a safe, resource-rich time to have a baby.” In response, the hypothalamus wisely suppresses the GnRH “master forecast”.²³ This suppression creates a domino effect, reducing the FSH and LH signals needed for a follicle to mature and for ovulation to occur.²⁵
• The Result: Your ecosystem intelligently conserves its precious resources by pausing the energy-intensive process of ovulation. Consequently, your period is delayed.²⁹ The anxiety you feel about the late period can, ironically, release more cortisol, potentially delaying it even further.⁶

2. Shifting Tides of Lifestyle

Your body is exquisitely sensitive to changes in its daily inputs and outputs.

Major shifts in diet, exercise, or sleep can create waves that disrupt your cycle’s rhythm.

The unifying principle here is “energy availability”—your body is constantly assessing if it has enough resources to sustain a potential pregnancy.¹⁴

• Diet and Weight Changes: Your body requires a certain percentage of body fat to ovulate properly.²⁶ Drastic dieting, under-eating, or nutritional deficiencies are interpreted by the ecosystem as a famine. Conversely, rapid weight gain can also disrupt hormonal balance.²⁶ These are signals of resource instability, prompting the body to conserve energy by delaying ovulation.
• Excessive Exercise: While moderate exercise is beneficial, extreme physical activity—like training for a marathon or engaging in rigorous ballet—can put your body into an energy deficit, especially if you’re not increasing your calories to match.²⁶ Your ecosystem logically prioritizes fuel for your muscles and brain over reproduction, and ovulation can be paused.¹⁴
• Sleep Disruption and Travel: Sleep is when your ecosystem recalibrates. Poor sleep habits or crossing time zones disrupts your circadian rhythm, the 24-hour internal clock that influences the rhythmic release of reproductive hormones.³³
• The Insulin Connection: A diet high in processed foods can lead to insulin resistance, a state where your cells don’t respond well to the hormone insulin. This can disrupt the delicate balance of reproductive hormones.³⁶ This is especially true in the second half of the cycle (the luteal phase), when rising progesterone naturally increases insulin resistance slightly, which is why you might feel less stable or crave more carbs before your period.³⁷

3. Introducing Foreign Elements (Medications)

Certain medications can act like “invasive species” or “pollutants” in your ecosystem, directly altering the hormonal weather patterns.

• Hormonal Birth Control (Starting or Stopping): This is the most direct manipulation. Hormonal contraceptives work by providing an external source of hormones that suppresses your body’s natural cycle. When you stop taking them, it can take two or three months for your ecosystem to reboot and re-establish its own rhythm.³¹
• Antidepressants and Antipsychotics: These medications work on brain chemistry and can influence the hypothalamus and pituitary—the “climate control center”—potentially leading to irregular cycles as a side effect.²⁶
• Thyroid Medication: If you’re being treated for a thyroid condition, the medication directly adjusts your body’s “thermostat.” Finding the right dose can sometimes cause temporary fluctuations in your cycle.³⁹
• Other Medications: Chemotherapy is a major disruption to the entire body, including the reproductive system. Even common drugs like blood thinners (aspirin, warfarin) don’t typically delay periods but can cause a heavier flow, which is an important distinction to note.³⁹

Part V: When the Climate Shifts: Investigating Underlying Conditions

Sometimes, an irregular cycle isn’t just a response to temporary “weather” but a sign of a more persistent, long-term shift in your ecosystem’s “climate.” These are underlying medical conditions that require a doctor’s diagnosis and management.

1. Polycystic Ovarian Syndrome (PCOS): The Overgrowth of Androgens

PCOS is a very common hormonal condition, affecting as many as 1 in 10 women of childbearing age.⁴²

• Ecosystem Analogy: Think of PCOS as a climate where one type of “plant”—androgens (hormones like testosterone)—begins to overgrow. This hormonal imbalance disrupts the entire landscape.
• The Mechanism: These high levels of androgens prevent the follicles in the ovaries from fully maturing and being released. Instead of ovulation, small cysts may form on the ovaries, and periods become irregular or stop altogether.⁴⁴ A key factor is that PCOS is often linked to insulin resistance, which can further fuel the overproduction of androgens, creating a vicious cycle.⁴⁴
• Other Clues: Besides irregular periods, other signs of this climate shift include persistent acne (especially past the teen years), excess hair growth on the face or body, thinning hair on the head, and difficulty maintaining a healthy weight.⁴⁴

2. Thyroid Disorders: A Faulty Thermostat

The thyroid is a small gland in your neck that acts as your body’s master thermostat, controlling metabolism.⁴⁶

If it’s underactive (hypothyroidism) or overactive (hyperthyroidism), it can throw off the timing of your entire cycle.²⁶

• Ecosystem Analogy: If the ecosystem’s thermostat is set too low or too high, the timing of all biological processes, including the “seasons” of the menstrual cycle, becomes unpredictable.
• The Mechanism: Both an overactive and an underactive thyroid can interfere with the hormonal signals from the brain and prevent ovulation, leading to light, heavy, or irregular periods.²⁶

3. Perimenopause: A Natural Change of Seasons

Perimenopause is not a disorder but a natural life transition—the period of time leading up to menopause, which typically begins in a woman’s 40s.²⁶

• Ecosystem Analogy: This is a fundamental, gradual change in the ecosystem’s climate as it prepares for a new phase. The hormonal “weather patterns” become more erratic as the ovaries’ production of estrogen rises and falls unevenly.⁵⁰
• The Experience: Irregular periods are a hallmark of this transition. The time between periods may get longer or shorter, you may skip periods entirely, and your flow may change.⁴⁹ This is a normal part of your body’s journey.

Table: A Field Guide to Your Menstrual Ecosystem

In a moment of anxiety, a quick reference can be grounding.

Use this table as a field guide to help you interpret the signals from your body.

It translates complex biology into the ecosystem framework, offering a clear potential cause and a practical next step.

The Signal (Symptom)	Potential Environmental Pressure / Climate Shift (Cause)	How It Affects Your Ecosystem (The Mechanism)	Recommended Action (What You Can Do)
Late or Missed Period	High Stress (Emotional or Physical)	The “drought hormone” cortisol signals that it’s not safe to reproduce, pausing the “weather patterns” of ovulation.12	Practice stress management. If you miss 3+ cycles, consult a doctor.25
Late or Missed Period	Significant Diet/Weight Change	The ecosystem senses a change in “resource availability” and conserves energy by pausing reproduction.26	Focus on balanced nutrition. Avoid extreme diets. Consult a doctor or nutritionist for guidance.
Late or Missed Period	Excessive Exercise	The ecosystem enters an “energy deficit,” prioritizing survival over the energy-intensive process of ovulation.14	Ensure caloric intake matches energy expenditure. Balance high-intensity workouts with rest.
Irregular Cycles	Starting/Stopping Hormonal Birth Control	The ecosystem’s natural “climate control” was being externally managed. It may take a few cycles to re-establish its own rhythm.31	Be patient for 2-3 months. Track your cycle. If it doesn’t regulate, see your doctor.
Irregular Cycles, Acne, Excess Hair Growth	Polycystic Ovary Syndrome (PCOS)	A “climate” of hormonal imbalance, often with an “overgrowth” of androgens, prevents regular ovulation.44	Consult a doctor for diagnosis and a management plan, which may include lifestyle changes and medication.
Irregular Cycles, Fatigue, Weight Changes	Thyroid Disorder	The ecosystem’s “thermostat” is malfunctioning, disrupting the timing of all metabolic processes, including the menstrual cycle.46	See a doctor for a simple blood test to check thyroid function.
Skipped Periods, Hot Flashes (Age 40+)	Perimenopause	A natural, long-term “change of seasons” as the ecosystem prepares for menopause. Hormonal “weather” becomes more erratic.49	Track symptoms. Discuss management options with your doctor if symptoms are disruptive.

Part VI: Reading the Signs: When to Call an Ecologist (Your Doctor)

While it’s empowering to understand your body’s signals, some signs indicate it’s time to consult an expert—your doctor or gynecologist.

Think of them as a trained ecologist who can help you assess the health of your system.

The most consistent piece of medical advice is the “Rule of Three”: if you have missed three or more consecutive periods and you know you are not pregnant, it’s time to make an appointment.²⁵

A single missed period can be a blip, but three in a row suggests a more persistent issue that needs investigation.

Other key signals that warrant a doctor’s visit include:

• Cycles that are consistently shorter than 21 days or longer than 35 days.¹¹
• Bleeding that is so heavy you’re soaking through a pad or tampon every hour for several hours, or that lasts longer than seven days.¹¹
• Severe pain or cramping that disrupts your daily life.¹¹
• Any signs that point toward an underlying condition, such as the combined symptoms of PCOS or a thyroid disorder.

To make your appointment as productive as possible, become your own field researcher.

Track your cycles on a calendar or with an App. Note your symptoms, their timing, and their severity.

This data is invaluable for your doctor to help you understand what’s happening in your unique ecosystem.¹¹

Conclusion: Becoming the Steward of Your Own Body

A late period is more than a biological event; it’s an emotional journey that can take you from low-level worry to full-blown panic.

But it doesn’t have to be that Way. The journey from the fear of “Why is my period late?” to the curiosity of “What is my body telling me?” is a powerful one.

It’s a shift from seeing your body as an adversary to seeing it as an intelligent partner.

My own experience taught me that a late period is not a sign of failure.

It is a biological signal from a complex, wise, and responsive system that is always striving for balance.

The goal isn’t to force your body into a “perfect,” rigid cycle.

The true goal is to learn to listen to it, to understand its unique rhythms and needs, and to become a knowledgeable and compassionate steward of your own internal ecosystem.

This transforms a moment of fear into an opportunity for deeper self-knowledge, better health, and a more peaceful relationship with the incredible body you call home.¹³

Works cited

1. Period was late, I was really scared to be pregnant. Turns out the negative pregnancy test crushed me just as much : r/Fencesitter – Reddit, accessed August 9, 2025, https://www.reddit.com/r/Fencesitter/comments/itb8ia/period_was_late_i_was_really_scared_to_be/
2. pls tell me stories about your period being late BUT not being pregnant – Reddit, accessed August 9, 2025, https://www.reddit.com/r/TheGirlSurvivalGuide/comments/cyoewb/pls_tell_me_stories_about_your_period_being_late/
3. Late period anxiety : r/TheGirlSurvivalGuide – Reddit, accessed August 9, 2025, https://www.reddit.com/r/TheGirlSurvivalGuide/comments/74kb7n/late_period_anxiety/
4. Having anxiety attacks over late periods? : r/childfree – Reddit, accessed August 9, 2025, https://www.reddit.com/r/childfree/comments/5md743/having_anxiety_attacks_over_late_periods/
5. Whats your scariest late period story? : r/AskWomen – Reddit, accessed August 9, 2025, https://www.reddit.com/r/AskWomen/comments/9shrh5/whats_your_scariest_late_period_story/
6. Can stress make your period late? | BetterHelp, accessed August 9, 2025, https://www.betterhelp.com/advice/stress/can-stress-make-your-period-late/
7. Why Anxiety Spikes With Your Period – Everyday Health, accessed August 9, 2025, https://www.everydayhealth.com/anxiety/why-anxiety-spikes-with-your-period.aspx
8. When You’ve Missed a Period and You’re Scared…. – Avenue Women’s Center, accessed August 9, 2025, https://avenuewomenscenter.com/when-youve-missed-a-period-and-youre-scared/
9. Missed period due to stress or pregnancy? – inviTRA, accessed August 9, 2025, https://www.invitra.com/en/forums/topic/missed-period-due-to-stress-or-pregnancy/
10. Menstrual Cycle – Women’s Health Issues – Merck Manual Consumer Version, accessed August 9, 2025, https://www.merckmanuals.com/home/women-s-health-issues/biology-of-the-female-reproductive-system/menstrual-cycle
11. Period calculator: Predict your next cycle – Flo, accessed August 9, 2025, https://flo.health/tools/period-calculator
12. Can Stress Cause a Missed or Late Period? | Eugene OR, accessed August 9, 2025, https://www.drbeyerlein.com/stress-cause-missed-late-period
13. Full article: Taking Charge of the Menstrual Cycle: Discourses of Menstruation and the Menstruating Body in Self-Help Literature, accessed August 9, 2025, https://www.tandfonline.com/doi/full/10.1080/23293691.2022.2085532
14. 11 Period Myths and Facts | 700 Children’s Blog, accessed August 9, 2025, https://www.nationwidechildrens.org/family-resources-education/700childrens/2025/02/11-period-myths-and-facts
15. The Truth About 5 Common Period Myths – Penn Medicine Chester County Hospital, accessed August 9, 2025, https://www.chestercountyhospital.org/news/health-eliving-blog/2019/july/period-myths
16. Gaia hypothesis – Wikipedia, accessed August 9, 2025, https://en.wikipedia.org/wiki/Gaia_hypothesis
17. The Menstrual Cycle | Patient Education – UCSF Health, accessed August 9, 2025, https://www.ucsfhealth.org/education/the-menstrual-cycle
18. Understanding the Phases of the Menstrual Cycle – Clue app, accessed August 9, 2025, https://helloclue.com/articles/cycle-a-z/the-menstrual-cycle-more-than-just-the-period
19. The Normal Menstrual Cycle and the Control of Ovulation – Endotext – NCBI Bookshelf, accessed August 9, 2025, https://www.ncbi.nlm.nih.gov/books/NBK279054/
20. The menstrual cycle – YouTube, accessed August 9, 2025, https://www.youtube.com/watch?v=7HlHGLr1hTA&pp=0gcJCfwAo7VqN5tD
21. How Stress Affects Your Menstrual Cycle | UT Physicians, accessed August 9, 2025, https://www.utphysicians.com/how-stress-can-affect-your-menstrual-cycle/
22. Can Stress Cause Missed Periods? – Big Apple Medical Care, accessed August 9, 2025, https://www.bigapplemedicalcare.com/can-stress-cause-missed-periods/
23. How Does Stress Impact Your Period? – Healthline, accessed August 9, 2025, https://www.healthline.com/health/stress/can-stress-mess-up-your-period
24. Regulation of the hypothalamic-pituitary-adrenocortical stress response – PubMed Central, accessed August 9, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC4867107/
25. Is Stress Affecting My Menstrual Cycle? Understanding the Connection, accessed August 9, 2025, https://legacyforwomenobgyn.com/is-stress-affecting-menstrual-cycle/
26. Why Is My Period Late? Common Causes And Reasons – Dr. Len Kliman, accessed August 9, 2025, https://drlenkliman.com.au/articles/why-is-my-period-late-common-causes-and-reasons/
27. Stress and the Reproductive Cycle | The Journal of Clinical Endocrinology & Metabolism | Oxford Academic, accessed August 9, 2025, https://academic.oup.com/jcem/article/84/6/1768/2864142
28. The Impact of Stress on Menstrual Cycles – Arjang Naim, MD, accessed August 9, 2025, https://drarjangnaim.com/the-impact-of-stress-on-menstrual-cycles/
29. Common lifestyle factors that affect your menstrual cycle – Hummingway, accessed August 9, 2025, https://ourhummingway.com/article/common-lifestyle-factors-that-affect-your-menstrual-cycle-or-hummingway/
30. Missed your period but not pregnant? 7 possible causes – UCLA Health, accessed August 9, 2025, https://www.uclahealth.org/news/article/missed-your-period-not-pregnant-7-possible-causes-2
31. 4 reasons your period is late (besides pregnancy) – Nebraska Medicine, accessed August 9, 2025, https://www.nebraskamed.com/health/conditions-and-services/womens-health/4-reasons-your-period-is-late-besides-pregnancy
32. Menstrual abnormalities and their association with lifestyle pattern in …, accessed August 9, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC6132013/
33. How Can Lifestyle Factors Affect Menstrual Health? – Winfertility, accessed August 9, 2025, https://winfertility.in/how-can-lifestyle-factors-affect-menstrual-health/
34. www.betterhealth.vic.gov.au, accessed August 9, 2025, https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/menstruation-amenorrhoea
35. Light on Shedding: A Review of Sex and Menstrual Cycle Differences in the Physiological Effects of Light in Humans – PubMed Central, accessed August 9, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC9902977/
36. How to manage blood sugar and insulin resistance across the menstrual cycle • #1 Continuous Glucose Monitoring App Australia | Vively, accessed August 9, 2025, https://www.vively.com.au/post/glucose-and-insulin-resistance-across-the-menstrual-cycle
37. What Happens to Your Blood Glucose Levels During Your Menstrual Cycle? – Veri, accessed August 9, 2025, https://www.veri.co/learn/can-your-period-affect-your-blood-sugar
38. Menstruation and T1D – Breakthrough T1D Canada, accessed August 9, 2025, https://breakthrought1d.ca/life-with-t1d/menstruation-and-type-1-diabetes/
39. Meds That Can Affect Your Period: HRT, Aspirin, NSAIDs, and More, accessed August 9, 2025, https://www.webmd.com/women/meds-affect-period
40. www.yourperiod.ca, accessed August 9, 2025, https://www.yourperiod.ca/abnormal-pain-and-menstrual-bleeding/heavy-menstrual-bleeding/medications-that-cause-heavy-menstrual-bleeding/
41. Medicines That Can Cause Changes in Menstrual Bleeding – Kaiser Permanente, accessed August 9, 2025, https://healthy.kaiserpermanente.org/health-wellness/health-encyclopedia/he.medicines-that-can-cause-changes-in-menstrual-bleeding.tv7209
42. Menstrual Disorders | OB-GYN – UC Davis Health, accessed August 9, 2025, https://health.ucdavis.edu/conditions/obgyn/menstrual-disorders
43. www.hopkinsmedicine.org, accessed August 9, 2025, https://www.hopkinsmedicine.org/health/conditions-and-diseases/polycystic-ovary-syndrome-pcos#:~:text=PCOS%20is%20a%20very%20common%20hormone%20problem%20for%20women%20of,%2C%20infertility%2C%20and%20weight%20gain.
44. PCOS (Polycystic Ovary Syndrome): Symptoms & Treatment, accessed August 9, 2025, https://my.clevelandclinic.org/health/diseases/8316-polycystic-ovary-syndrome-pcos
45. Polycystic Ovary Syndrome (PCOS) (for Teens) | Nemours KidsHealth, accessed August 9, 2025, https://kidshealth.org/en/teens/pcos.html
46. What causes menstrual irregularities? | NICHD – Eunice Kennedy …, accessed August 9, 2025, https://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/causes
47. Thyroid disease – Office on Women’s Health, accessed August 9, 2025, https://womenshealth.gov/a-z-topics/thyroid-disease
48. Thyroid Disorders in Women | Johns Hopkins Medicine, accessed August 9, 2025, https://www.hopkinsmedicine.org/health/conditions-and-diseases/thyroid-disorders-in-women
49. www.mayoclinic.org, accessed August 9, 2025, https://www.mayoclinic.org/diseases-conditions/perimenopause/symptoms-causes/syc-20354666#:~:text=Your%20menstrual%20cycles%20may%20lengthen,to%20help%20ease%20these%20symptoms.
50. Perimenopause – Symptoms and causes – Mayo Clinic, accessed August 9, 2025, https://www.mayoclinic.org/diseases-conditions/perimenopause/symptoms-causes/syc-20354666
51. Menopause: What It Is, Age, Stages, Signs & Side Effects – Cleveland Clinic, accessed August 9, 2025, https://my.clevelandclinic.org/health/diseases/21841-menopause
52. When to worry about missing your period | Women’s Health | UT …, accessed August 9, 2025, https://utswmed.org/medblog/missing-period-amenorrhea/
53. 15 period mythbusters – Wellbeing of Women, accessed August 9, 2025, https://www.wellbeingofwomen.org.uk/health-information/15-period-mythbusters/
54. My journey with PMDD | Jean Hailes, accessed August 9, 2025, https://www.jeanhailes.org.au/news/my-journey-with-pmdd
55. Love Stories to Our Periods: 3 Personal Reflections – joni, accessed August 9, 2025, https://getjoni.com/blogs/blog/love-stories-to-our-periods