When do you ovulate?
You usually ovulate 12 to 14 days before your next period starts. In a 28-day cycle that's around day 14, in a 32-day cycle around day 18, and in a 24-day cycle around day 10. The exact day shifts from cycle to cycle, so signs like stretchy discharge or a positive LH test help pin it down.
What happens when you ovulate
In the first half of your cycle, a follicle in one ovary grows and makes estrogen. When estrogen is high enough, your brain releases a surge of luteinizing hormone (LH). About 24 to 36 hours later the follicle releases an egg. That's ovulation. The empty follicle becomes the corpus luteum, which makes progesterone through the luteal phase.
How to estimate your ovulation day
- Count back from your next period. Subtract 14 from your average cycle length. It's a starting point, not a promise.
- Watch your discharge. In the days before ovulation it becomes clear, slippery and stretchy, like raw egg white.
- Use LH tests. A positive result means ovulation is likely in the next day or so.
- Track temperature. Your resting temperature rises slightly after ovulation and stays up until your period. It confirms ovulation after the fact, not before.
- Notice your body. Some people feel a one-sided twinge, tender breasts or a higher sex drive.
| Cycle length | Likely ovulation day | Fertile window (approx.) |
|---|---|---|
| 24 days | Day 10 | Days 5 to 10 |
| 28 days | Day 14 | Days 9 to 14 |
| 32 days | Day 18 | Days 13 to 18 |
| 35 days | Day 21 | Days 16 to 21 |
Try our ovulation calculator for your own dates.
Why your ovulation day moves
Most of the variation in cycle length is variation in when you ovulate. Stress, illness, travel, poor sleep, intense training, breastfeeding, PCOS and perimenopause can all push ovulation later, or occasionally stop it for a cycle. In one study, women with regular cycles still had a 1 to 6% chance of being fertile on the day their next period was expected, because ovulation was so late.
Because ovulation moves, calendar estimates are not a reliable way to avoid pregnancy. Use contraception if you don't want to get pregnant.
How ovulation feels emotionally
Around ovulation, estrogen peaks and testosterone rises a little. Many people feel more social, energetic and confident. Some notice a brief dip or mood swing around ovulation as estrogen drops right after. Knowing your ovulation day also tells you when the luteal phase, and PMS, will start.
When to talk to a doctor
See a doctor if your cycles are very irregular or longer than 35 days, if you never see signs of ovulation, if mid-cycle pain is severe, or if you've been trying to get pregnant for a year (six months if you're 35 or older). Irregular ovulation is common with PCOS and thyroid problems, and both are treatable.
Frequently asked questions
Can you ovulate without a period?
Yes, ovulation comes before a period, so you can ovulate before your first period after the pill, birth or breastfeeding. See can you ovulate without a period.
Can you feel ovulation?
Some people feel a twinge on one side of the lower tummy, called mittelschmerz. Many feel nothing. See can you feel ovulation.
Do you ovulate every month?
Most cycles in adults are ovulatory, but it's normal to skip ovulation occasionally, especially in the teen years, perimenopause, with PCOS or during stress.
Is ovulation the same as the fertile window?
No. Ovulation is the single moment the egg is released. The fertile window is the six days ending on ovulation day. See what is the fertile window.
Sources
- Cleveland Clinic: Ovulation
- Wilcox AJ, Dunson D, Baird DD. The timing of the fertile window in the menstrual cycle. BMJ (2000)
- NHS: Fertility in the menstrual cycle
- Bull JR et al. Real-world menstrual cycle characteristics of more than 600,000 menstrual cycles. npj Digital Medicine (2019)
This page is for information only and isn鈥檛 medical advice. If something worries you, please talk to a doctor.
Keep reading
Ovulation calculator: when do I ovulate?Free ovulation calculator: enter your last period and cycle length to see your likely ovulation day for the next 4 cycles. Private, instant, estimates only.How many days after your period do you ovulate?How many days after your period is ovulation? Often about 7 to 10 days after bleeding stops, but it depends on your cycle. A simple way to work it out.
What are the signs of ovulation?Signs of ovulation: egg-white discharge, a positive LH test, a temperature rise, one-sided twinges and higher sex drive. What each means and how to read them.
Ovulation phase: signs, timing and feelingsThe ovulation phase explained: when you ovulate, how long it lasts, the signs and symptoms to look for, and why mood, energy and libido often peak.
Mood swings during ovulation: why mid-cycle can feel wobblyMood swings during ovulation are less talked about than PMS, but real for some. Why the estrogen peak and dip can bring anxiety or low mood, and what helps.