What Your Fertility History Reveals About Your Perimenopause
Think about how women are taught about their own ovaries. As teenagers, we get a lesson about periods and pregnancy prevention. In our twenties and thirties, if we want children, we may get a crash course in ovulation and fertility. Then the curtain closes, and it does not open again until our forties or fifties, when hot flashes or a skipped period force the topic of menopause onto the stage.
I understand why medicine divides things this way. But biologically, it makes very little sense. The same ovaries, the same supply of eggs, and the same conversation between your brain and your ovaries are at work from your first period to your last. Your fertility years and your perimenopause are not two separate stories. They are chapters of the same one.
When women understand that, they make better decisions: about when to seek fertility help, about whether a test result should worry them, about contraception in their forties, and about their long-term heart and bone health. So let's walk through what your reproductive history may be telling you.
Two things change with time. The number of remaining eggs falls, and the proportion of eggs that are chromosomally normal declines.
Your Ovaries Age Gradually, Not Overnight
A woman is born with all the eggs she will ever have, stored in tiny structures called follicles. From before birth onward, that supply steadily declines. Each month, a group of follicles begins to develop, usually one matures and releases an egg, and the rest are lost.
Two things change with time. The number of remaining eggs falls, and the proportion of eggs that are chromosomally normal declines. That second change is the bigger driver of the age-related drop in fertility and the rise in miscarriage risk. An older egg is more likely to divide its chromosomes incorrectly as it matures, which can prevent a pregnancy from implanting or continuing.
Perimenopause is what happens when this gradual process reaches the point where the remaining follicles can no longer respond reliably to the brain's signals. Ovulation becomes inconsistent, hormone levels swing more widely, and eventually periods stop. Menopause is confirmed after 12 consecutive months without a period.
The key word here is gradual. There is no single birthday on which fertility vanishes, and there is no single day on which perimenopause begins.
Your Cycle Length Is Data
One of the earliest and most underappreciated signs of ovarian aging is a change in cycle length.
Here is what is happening. As the egg supply shrinks, the ovaries produce less of a hormone called inhibin B, which normally helps keep follicle-stimulating hormone (FSH) in check. FSH begins to rise, which can push follicles to develop sooner. The first half of the cycle shortens, and many women in their late thirties and early forties notice their periods arriving a few days earlier than they used to.
Later, as ovulation becomes less reliable, cycles often lengthen and become irregular. The research framework clinicians use to stage reproductive aging (called STRAW+10) defines the early menopause transition as a persistent difference of seven days or more in the length of consecutive cycles, and the late transition as going 60 days or more without a period.
What matters is not whether your cycle fits a textbook number. It is whether your cycle has changed from your own normal. That is why I encourage women to track their periods consistently, even when pregnancy is not the goal. Note the first day of each period, the number of days between periods, any change in flow, spotting between periods, and new pelvic pain.
And please hear this: not every change is hormonal. Very heavy bleeding, bleeding between periods or after sex, or new pelvic pain deserves an evaluation. Fibroids, polyps, adenomyosis, thyroid disease, and other conditions can all mimic or overlap with perimenopause, and they should not be dismissed as "just your age."
AMH: Helpful, But Not a Crystal Ball
Anti-Müllerian hormone (AMH) is made by the small, developing follicles in your ovaries. Because it reflects how many of these follicles are present, it serves as a marker of ovarian reserve, an estimate of how many eggs remain.
AMH has real value. In a fertility clinic, it helps predict how the ovaries may respond to stimulation medications for egg freezing or IVF. It can prompt timely conversations for women who want children later and have a low result.
But it is frequently misunderstood, so let me be direct about its limits.
AMH does not measure egg quality. There is no blood test that tells you whether your eggs are chromosomally normal. Age remains the best predictor of that.
AMH does not predict your natural fertility. In a well-known study published in JAMA, women ages 30 to 44 with low AMH were not less likely to conceive naturally over a year of trying than women with normal levels. A low number on a lab report is not a diagnosis of infertility.
AMH does not tell you when menopause will begin. Across large groups of women, lower AMH is associated with earlier menopause, but a single result cannot pinpoint an individual woman's timeline. The American College of Obstetricians and Gynecologists advises against using AMH to predict menopause timing or fertility in women who are not seeking fertility care.
I believe women deserve access to information about their bodies. But information without interpretation can create unnecessary fear. If you check your AMH, make sure someone who understands its limits explains what it does and does not mean for you.
Your Reproductive History Belongs in Your Lifelong Medical Record
This is the part of the conversation I wish every woman heard.
Your reproductive history is not disposable once you are done having children or once pregnancy is no longer possible. Certain experiences are associated with health risks later in life, and knowing them allows you and your doctor to be proactive.
The American Heart Association recognizes that adverse pregnancy outcomes, including preeclampsia and other high blood pressure disorders of pregnancy, gestational diabetes, preterm delivery, and delivering a baby small for gestational age, are linked to a higher risk of cardiovascular disease decades later. Polycystic ovary syndrome is associated with insulin resistance and metabolic risk. Going through menopause before 40 (primary ovarian insufficiency) or before 45 (early menopause) is associated with higher risks to the heart, bones, and brain, and these women often benefit from hormone therapy until the average age of menopause unless there is a reason to avoid it.
None of these histories causes future disease, and none of them guarantees it. They are signals. If any of them is part of your story, make sure every doctor caring for you knows, and ask how it should shape your screening for blood pressure, cholesterol, blood sugar, and bone density.
When to Ask for a Fertility Evaluation
If you are trying to conceive, standard guidance recommends an evaluation after 12 months of trying if you are under 35, after six months if you are 35 or older, and sooner (often right away) after 40.
Do not wait that long if you have irregular or very short cycles, known or suspected endometriosis, a history of pelvic infection or surgery, previous chemotherapy or pelvic radiation, recurrent pregnancy loss, or a family history of early menopause.
And remember that fertility is a two-person question. Male factors contribute to roughly half of couples' infertility, either alone or in combination with female factors. A semen analysis is simple, inexpensive, and belongs at the beginning of an evaluation, not the end. Because sperm are continuously produced over a roughly two-to-three-month cycle, a partner's health, medications, smoking, and substance use in the months before conception matter too.
Yes, You Can Still Get Pregnant in Perimenopause
This one surprises a lot of women. Irregular cycles do not mean you have stopped ovulating. They mean you ovulate less predictably, which can actually make an unplanned pregnancy more likely if you have assumed you are "too old" or that a skipped period means you are done.
If you do not want to become pregnant, continue using contraception until menopause is confirmed. Many low-dose hormonal methods are safe for healthy, non-smoking women into their late forties and early fifties, and some can ease perimenopausal symptoms such as heavy bleeding at the same time. Your provider can help you decide when it is safe to stop, which for many women is around age 50 to 55.
And because a late or missed period, breast tenderness, fatigue, and mood changes can signal either pregnancy or perimenopause, a pregnancy test is a sensible first step whenever pregnancy is possible.
What to Bring to Your Next Appointment
You do not need every hormone test available. You need a provider who looks at the whole arc of your reproductive life. Come prepared with:
Your cycle history, including any recent change in length, flow, or spotting
Any past fertility testing or treatment, including AMH results
Pregnancy history and complications (preeclampsia, gestational diabetes, preterm birth, losses)
Diagnoses such as PCOS, endometriosis, fibroids, or thyroid disease
Your mother's or sisters' age at menopause, if you know it
Your goals: trying to conceive, preventing pregnancy, or managing symptoms
The women I care for are often relieved to learn that the changes they noticed years ago were not random. Their bodies were communicating the entire time. You deserve a provider who listens to that story with you and helps you act on it, whether that means pursuing a pregnancy, preventing one, protecting your heart, or preparing for a healthier menopause. If you have not found that provider yet, keep looking. You are worth the search.
Defy Menopause - Own the Change
Many women tell me: "One day I feel amazing. The next, I can barely get out of bed. Is this normal?"
Yes, it is. And no, you don’t have to suffer through it alone.
Hormonal fluctuations during perimenopause can make you feel like you’ve lost control of your body. But knowledge is powerful. And there are clear, science-backed ways to support your hormones, ease symptoms, and reclaim your energy.
That’s exactly why I created Defy Menopause: Own the Change — a 30-day program designed to give you the tools, knowledge, and support you need to move through these changes with clarity and confidence.
Inside, you’ll find:
Access to Dr. Tracy Verrico at one (1) live, group session
Clear action steps for managing symptoms naturally
Because you deserve more than just "putting up with it."
You deserve to thrive.
Let’s Connect
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Medical Disclaimer: The information provided in this blog is for general educational and informational purposes only and is not intended as, nor should it be considered, medical advice. This content does not establish a physician-patient relationship and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read in this newsletter. If you think you may have a medical emergency, call your doctor or emergency services immediately.
References
Harlow SD, et al. Executive summary of the Stages of Reproductive Aging Workshop + 10: addressing the unfinished agenda of staging reproductive aging. Menopause. 2012;19(4):387-395
Practice Committee of the American Society for Reproductive Medicine. Testing and interpreting measures of ovarian reserve: a committee opinion. Fertil Steril. 2020;114(6):1151-1157.
American College of Obstetricians and Gynecologists. The Use of Antimüllerian Hormone in Women Not Seeking Fertility Care. Committee Opinion No. 773. Obstet Gynecol. 2019;133(4):e274-e278.
Steiner AZ, et al. Association Between Biomarkers of Ovarian Reserve and Infertility Among Older Women of Reproductive Age. JAMA. 2017;318(14):1367-1376.
American College of Obstetricians and Gynecologists and American Society for Reproductive Medicine. Female Age-Related Fertility Decline. Committee Opinion No. 589. Obstet Gynecol. 2014;123(3):719-721.
Practice Committee of the American Society for Reproductive Medicine. Definitions of infertility and recurrent pregnancy loss: a committee opinion. Fertil Steril. 2020;113(3):533-535.
Schlegel PN, et al. Diagnosis and Treatment of Infertility in Men: AUA/ASRM Guideline. J Urol. 2021;205(1):36-43.
Parikh NI, et al. Adverse Pregnancy Outcomes and Cardiovascular Disease Risk: Unique Opportunities for Cardiovascular Disease Prevention in Women. A Scientific Statement From the American Heart Association. Circulation. 2021;143(18):e902-e916.
Okoth K, et al. Association between the reproductive health of young women and cardiovascular disease in later life: umbrella review. BMJ. 2020;371:m3502.
Nguyen AT, et al. U.S. Medical Eligibility Criteria for Contraceptive Use, 2024. MMWR Recomm Rep. 2024;73(4):1-126.
The 2022 Hormone Therapy Position Statement of The North American Menopause Society. Menopause. 2022;29(7):767-794.
