Fertility during perimenopause is significantly reduced, but conception is still possible for many women, especially in the early stages of the transition. About 33% of women are infertile by age 40, rising to 87% by age 45. Those numbers are sobering, but they also mean a meaningful percentage of women in their early 40s can still conceive, particularly with targeted lifestyle changes, the right supplements, and a clear understanding of their remaining fertile window.
Understanding Your Starting Point
Perimenopause isn’t a single phase. It begins when your menstrual cycles start changing, sometimes years before periods actually stop. In the early stage, your cycles may still be regular but your periods become lighter or heavier than usual. Later, cycle length becomes unpredictable, and ovulation happens less frequently. This distinction matters because your fertility strategy depends heavily on where you fall in this progression.
The most useful measure of where you stand is Anti-Müllerian Hormone (AMH), a blood test that estimates your remaining egg supply. Average AMH sits between 1.0 and 3.0 ng/mL. By age 40, typical levels drop to around 1.0 ng/mL, and by 45, they’re closer to 0.5 ng/mL. A level below 1.0 is considered low, and below 0.4 is severely low. Ask your doctor for an AMH test early in the process. It won’t tell you whether you can get pregnant, but it gives a realistic snapshot of your ovarian reserve and helps guide next steps.
One important caveat: standard blood tests for hormones like estrogen and LH are unreliable during perimenopause because these hormones fluctuate wildly, sometimes swinging between premenopausal and postmenopausal levels within the same month. AMH is more stable and therefore more informative.
Track Ovulation More Carefully
If you’re trying to conceive naturally, timing intercourse around ovulation is critical. But standard ovulation predictor kits, which detect a surge in luteinizing hormone (LH), become less reliable during perimenopause. Your baseline LH levels may already be elevated, which can trigger false positives. Some perimenopausal cycles show double LH peaks close together, making it unclear which one (if either) signals actual ovulation. Other cycles show continuously high or continuously low hormone levels with no clear surge at all.
Quantitative hormone monitors that measure exact hormone levels, rather than just detecting whether hormones cross a threshold, give you a more accurate picture during irregular cycles. Pairing a monitor with basal body temperature tracking and cervical mucus observation improves your odds of identifying the cycles where ovulation actually occurs. During perimenopause, some cycles are simply anovulatory, meaning no egg is released. Recognizing those months saves you from unnecessary frustration.
Eat a Mediterranean-Style Diet
Diet is one of the most evidence-backed lifestyle changes for fertility at any age, and the Mediterranean diet in particular has strong research behind it. In a study of women undergoing IVF, those with the highest adherence to a Mediterranean eating pattern had a 48.8% live birth rate compared to 26.6% among those with the lowest adherence. That’s nearly double. Women over 35 who followed the diet at even a moderate level had a meaningfully lower risk of failed treatment cycles.
The pattern also correlates with better egg quality. Women eating a Mediterranean diet produced more fertilized eggs and more viable embryos. The likely reasons involve several overlapping mechanisms: the high antioxidant content from fruits, vegetables, and olive oil protects cells (including eggs) from oxidative damage. Omega-3 fatty acids from fish reduce inflammation. Whole grains help stabilize blood sugar and reduce the kind of chronic low-grade inflammation that impairs reproductive function.
In practical terms, this means building meals around vegetables, legumes, whole grains, nuts, olive oil, and fish. Limit processed foods, refined sugar, and red meat. You don’t need to follow the diet perfectly. The research shows benefits at moderate adherence levels, so consistent shifts in the right direction matter more than rigid meal plans.
Supplements That Support Egg Quality
As eggs age, their mitochondria (the energy-producing structures inside each cell) become less efficient. This is a core driver of declining fertility, because eggs need enormous amounts of energy to divide chromosomes correctly during fertilization. Two supplements target this problem directly.
CoQ10 is an antioxidant that supports mitochondrial energy production. Research suggests it may improve egg quality by helping aging eggs generate the energy needed for proper chromosome division, which reduces the risk of chromosomal abnormalities. The commonly used form is ubiquinol (the active form your body can use directly), at 200 to 300 mg taken three times daily. Start at least two to three months before trying to conceive, since eggs take roughly 90 days to mature.
DHEA is a hormone precursor that declines with age. Clinical studies have used 25 mg of micronized DHEA three times daily in women with diminished ovarian reserve. DHEA supplementation is more targeted toward women preparing for IVF, and because it’s a hormone, it’s worth discussing with a reproductive endocrinologist before starting. It’s not appropriate for everyone, particularly if you have hormone-sensitive conditions.
The Reality of Natural Conception Odds
For context, a woman at peak fertility (late 20s) has roughly a 30% chance of conceiving per cycle. By ages 35 to 39, that drops to about 15% per cycle. During perimenopause, the odds decline further and become harder to quantify because ovulation is inconsistent. Some months you may ovulate normally, others not at all.
Miscarriage risk also rises sharply. It’s about 10% for women aged 25 to 29, but climbs to over 53% for women 45 and older. This means that even when conception occurs, the likelihood of carrying to term is substantially lower. Chromosomal abnormalities in eggs are the primary driver of both failed implantation and early pregnancy loss at this stage.
None of this means pregnancy is impossible. It means the timeline is compressed, and each cycle matters more. If you’ve been trying for three to six months without success and you’re over 40, moving to a fertility specialist sooner rather than later is a practical decision, not an overreaction.
When Assisted Reproduction Makes Sense
IVF with your own eggs remains an option for women in early perimenopause, but success rates drop considerably after 43. For women aged 43 to 45, the cumulative live birth rate across multiple IVF cycles is about 8.4%. Per individual cycle, it’s even lower: roughly 3.4% for women 43 and older. The best predictor of success is how your ovaries respond in the first cycle. Women who produce four or more eggs in their first retrieval have a live birth rate around 13.3%. Women older than 43.5 who produce fewer than four eggs in their first cycle have essentially zero chance of success in subsequent cycles with their own eggs.
Donor eggs change the equation dramatically. Because the age of the egg matters far more than the age of the uterus, using eggs from a younger donor restores pregnancy rates to levels typical of the donor’s age group. For women in their mid-40s with a poor ovarian response, this is often the most realistic path to a live birth.
Other Factors Within Your Control
Beyond diet and supplements, several lifestyle factors influence fertility during perimenopause. Maintaining a healthy weight matters because both excess body fat and being underweight disrupt hormone signaling. Moderate exercise supports metabolic health and reduces inflammation, but extreme endurance training can suppress ovulation.
Sleep quality affects hormone regulation directly. Disrupted sleep, which is common during perimenopause due to night sweats and temperature changes, can further destabilize the hormonal patterns needed for ovulation. Prioritizing consistent sleep and managing perimenopausal symptoms that interfere with it supports your overall reproductive function.
Alcohol and smoking both accelerate ovarian aging. Smoking in particular is linked to earlier menopause and faster depletion of egg reserves. If you’re actively trying to conceive, eliminating both gives your remaining eggs the best environment possible. Caffeine in moderate amounts (one to two cups of coffee daily) has not been shown to significantly impair fertility, but higher intake may be worth cutting back.