You still get your period. It might be irregular, heavier than it used to be, or arrive at unexpected times — but it comes. So surely you’re still ovulating?
Not necessarily.
One of the most surprising and least-discussed aspects of perimenopause is anovulation — menstrual cycles in which no egg is released. You bleed, but nothing ovulates. And this matters a great deal for understanding what your body is going through.
What Anovulation Actually Means
Ovulation is the process by which your ovary releases a mature egg each month. In a typical cycle, the brain signals the ovaries using two hormones: follicle-stimulating hormone (FSH) and luteinising hormone (LH). FSH stimulates a follicle to grow and mature; a surge in LH triggers the egg’s release.
When anovulation occurs, this sequence breaks down. The follicle may begin to develop, oestrogen rises — but the precise hormonal cascade needed to trigger ovulation fails to complete. No egg is released. The cycle continues and bleeding eventually follows, but ovulation never happened.
This is not a rare event. For women in perimenopause, anovulatory cycles can become common — sometimes the majority of their cycles.
Why Perimenopause Causes Anovulation
As the ovarian reserve (the supply of eggs) diminishes with age, the ovaries become less responsive to FSH and LH signals from the brain. The brain tries harder — FSH levels rise — but the communication between the brain and ovaries becomes increasingly erratic.
Some months the system works. Some months it doesn’t. This is why perimenopausal cycles become so unpredictable: you may have a perfectly regular 28-day cycle one month, skip ovulation the next, then have a 45-day cycle the month after.
The key point: bleeding does not confirm ovulation. These are two separate events, and in perimenopause they can become uncoupled.
Why This Explains Heavier Periods
This is where it gets particularly important. When ovulation does occur, the empty follicle (now called the corpus luteum) produces progesterone. Progesterone’s job is to prepare the uterine lining for a potential pregnancy — and then, if pregnancy doesn’t occur, to cause that lining to shed in an orderly, controlled way.
When ovulation doesn’t happen, there is no corpus luteum and no progesterone. Oestrogen continues to stimulate the uterine lining, which grows thicker and thicker without progesterone to balance it. When the lining eventually sheds, it does so irregularly — often in heavier, longer, more clot-filled bleeds.
This is called oestrogen dominance — not because oestrogen is too high in absolute terms, but because it is unopposed by progesterone. And anovulation is the direct cause.
If you have been experiencing heavier periods in your 40s and wondering why, this mechanism is often the answer.
Anovulation Is Not the Same as Infertility
Women in perimenopause are sometimes told they “can’t get pregnant” — and sometimes told they “are definitely still ovulating.” Neither is reliably true on a cycle-by-cycle basis.
Anovulation does reduce fertility significantly, but it does not eliminate the possibility of pregnancy. In any given cycle, ovulation might still occur. This is why contraception remains relevant during perimenopause for women who do not wish to conceive — right up until 12 consecutive months without a period (menopause) if you are over 50, or 24 months if you are under 50.
“I was 44 and my periods were coming every 21 days and getting heavier every time. My doctor kept telling me my AMH levels were fine and I was ‘definitely still ovulating.’ But no one told me that an AMH test tells you about egg reserve, not whether you actually ovulated this month. I found out about anovulation from a women’s health article and finally had a conversation with a gynaecologist who actually understood what was happening.” — Priya, 46, Pune
The Indian Context: A Diagnosis Frequently Missed
In India, anovulation during perimenopause is almost never discussed with patients. Many women are reassured that because they are “still getting periods,” everything must be functioning normally.
Gynaecologists often point to AMH (anti-Müllerian hormone) or antral follicle count (AFC) as evidence that ovulation is occurring — but these tests measure ovarian reserve, not whether ovulation actually happened in a given cycle. The only ways to confirm ovulation are tracking basal body temperature, LH surge testing across a full cycle, or a mid-luteal phase progesterone test (done on Day 21 of a 28-day cycle, or 7 days after suspected ovulation).
If your periods are becoming heavier or longer and your gynaecologist hasn’t discussed anovulation with you, it is reasonable to raise it directly.
What Can Be Done
If anovulation is causing significant symptoms — particularly heavy bleeding — there are effective options:
- Progesterone supplementation: Micronised progesterone (sold in India as Susten, Lutein, or Gestofit) can be prescribed to oppose oestrogen’s effects on the uterine lining. This may be given cyclically (to regulate bleeding) or continuously as part of HRT.
- The Mirena IUS: A hormonal intrauterine system that releases a small amount of levonorgestrel locally into the uterus. It dramatically reduces heavy bleeding and is one of the most effective treatments available. It is available in India at many gynaecology clinics.
- Hormonal treatment for perimenopause: Full HRT that includes both oestrogen and progesterone can address the underlying hormonal fluctuations.
It is also worth having thyroid function checked — hypothyroidism is common in Indian women and can mimic or worsen anovulatory patterns.
Key Takeaways
- Anovulation means a menstrual cycle where no egg is released — bleeding still occurs but ovulation did not happen.
- During perimenopause, anovulatory cycles become increasingly common due to erratic FSH and LH signalling.
- Anovulation causes oestrogen dominance (no progesterone to balance oestrogen), which leads to heavier, longer, irregular periods.
- Bleeding does not confirm ovulation — these are separate events.
- Anovulation reduces fertility but does not eliminate pregnancy risk until full menopause is confirmed.
- In India, this is rarely discussed with patients — ask your gynaecologist specifically about it if you have heavy or irregular periods.
If you’re trying to understand what’s happening with your cycle and whether perimenopause could be a factor, our AI companion can help you think it through — privately, in a way that’s relevant to your life in India.
Frequently Asked Questions
What is anovulation in simple terms? Anovulation means your body goes through the motions of a menstrual cycle — you still bleed — but no egg is released from the ovaries. It is common during perimenopause when hormonal signalling becomes erratic.
Can you have a period without ovulating? Yes. Menstrual bleeding and ovulation are separate events. During perimenopause, anovulatory bleeding (a period without ovulation) becomes increasingly common. The bleeding is triggered by oestrogen withdrawal, not by ovulation.
How do I know if I am having anovulatory cycles? Signs include irregular cycle lengths, heavier or lighter than usual bleeding, the absence of mid-cycle signs (clear stretchy discharge, mild pelvic pain), and changes in basal body temperature. A blood test checking progesterone in the luteal phase (Day 21 of a 28-day cycle) can confirm whether ovulation occurred.
Does anovulation mean I cannot get pregnant? Anovulatory cycles reduce fertility significantly, but occasional ovulation can still occur during perimenopause. Contraception is still recommended until 12 months after your last period if you wish to avoid pregnancy.
Is anovulation the same as menopause? No. Anovulation is common throughout perimenopause — the transition phase before menopause. Menopause itself is confirmed only after 12 consecutive months without any period.
