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Signs of Ovulation

Ovulation is the moment an ovary releases an egg — and the few days around it are the only time in your cycle you can conceive. Your body gives off a handful of recognisable signals before and after it happens. Here are the eight most useful signs of ovulation, how reliable each one is, and how to put them together to find your fertile window.

The 8 signs of ovulation

1. Egg-white cervical mucus

The single most useful day-to-day sign. In the run-up to ovulation, rising oestrogen makes cervical mucus clear, slippery, and stretchy — much like raw egg white. This “fertile” mucus helps sperm travel and signals that your most fertile days are here. After ovulation it turns thicker, cloudy, or dries up.

2. A basal body temperature shift

After ovulation, progesterone nudges your resting body temperature up by about 0.3°C. Taken first thing every morning before getting up, this small but sustained rise confirms ovulation has already happened. On its own it can’t predict ovulation in advance, but charted over a few cycles it reveals your personal pattern.

3. Ovulation pain (mittelschmerz)

About one in five people feel a dull ache or sharp twinge on one side of the lower abdomen around the time of ovulation. It often switches sides from cycle to cycle and usually passes within a day. Felt at mid-cycle, it’s a helpful real-time clue.

4. A positive ovulation test (LH surge)

Ovulation predictor kits detect the surge of luteinising hormone (LH) that triggers the egg’s release, typically 24–36 hours beforehand. A positive test is one of the most precise ways to time your fertile window in advance, which is why many people trying to conceive use them alongside mucus tracking.

5. Changes in your cervix

Around ovulation the cervix tends to become softer, higher, and more open. It’s a sign you can learn to check yourself, though it takes practice to read confidently and is best used alongside the clearer signs above.

6. A higher sex drive

Many people notice their libido rises in the days leading up to ovulation — a neat bit of biology, since those are the days conception is possible. It’s subtle and not reliable on its own, but it often lines up with the fertile window.

7. Light spotting or breast tenderness

A small number of people see light mid-cycle spotting as hormones shift around ovulation, and some notice tender breasts. Both are minor supporting clues rather than stand-alone proof.

8. Heightened senses and mild bloating

A sharper sense of smell, taste, or sight, along with mild bloating or water retention, is reported by some people around ovulation. Like the softer signs above, these are most useful when they reinforce the reliable ones.

When does ovulation happen?

Ovulation usually occurs about 14 days before your next period, not 14 days after your last one. The luteal phase (after ovulation) stays fairly fixed at around 12–14 days, while the first half of the cycle is what varies. So someone with a 28-day cycle ovulates near day 14, while a 32-day cycle pushes ovulation closer to day 18. Because sperm can survive up to five days, your fertile window spans roughly the five days before ovulation plus ovulation day itself.

The most practical way to use all of this is to combine a couple of signs with a calendar estimate. Our Fertile Window Calculator estimates your ovulation day and fertile window from your last period and cycle length, and the Menstrual Cycle Calculator shows where ovulation sits across all four phases of your cycle.

How to track ovulation reliably

No single sign is perfect, so the trick is to stack a few. A common, effective combination is to watch your cervical mucus for the egg-white stage (predicts ovulation), confirm with basal body temperature (proves it happened), and add ovulation tests if you want precise timing. Over two or three cycles a clear personal pattern usually emerges. If you’re tracking to conceive, the days before ovulation are the ones that count most — by the time temperature confirms it, the fertile window is closing. After ovulation, our DPO day-by-day guide and Pregnancy Test Calculator help you time the two-week wait and the earliest reliable test.

When to see a provider

Signs of ovulation vary from person to person and cycle to cycle, and the occasional cycle without obvious signs is normal. But if you track carefully and see no fertile signs over several cycles, your periods are very irregular or absent, or you’ve been trying to conceive for a while without success (generally 12 months, or 6 months if you’re over 35), it’s worth speaking to a healthcare provider. They can check whether ovulation is happening regularly and look for treatable causes.

Frequently asked questions

What is the most reliable sign of ovulation?
Two signs stand out. Egg-white cervical mucus — clear, slippery, and stretchy like raw egg white — signals that ovulation is approaching and you're in your most fertile days. A sustained rise in basal body temperature (BBT) of about 0.3°C confirms ovulation has already happened. Mucus tells you it's coming; temperature confirms it's done. Used together they're the backbone of natural fertility tracking.
How many days before my period do I ovulate?
In most cycles, ovulation happens about 14 days before your next period starts — not 14 days after your last one. The second half of the cycle (the luteal phase) is fairly fixed at roughly 12–14 days, while the first half varies. So in a 28-day cycle you'd ovulate around day 14, but in a 32-day cycle it's closer to day 18.
Can you feel ovulation happening?
Some people do. A one-sided ache or twinge in the lower abdomen around mid-cycle — called mittelschmerz — is felt by roughly one in five people and can last from minutes to a day or two. Many others feel nothing at all, which is completely normal. Not feeling ovulation does not mean it isn't happening.
How long does ovulation last?
The release of the egg itself is a brief event, and the egg survives for only about 12–24 hours. But your fertile window is longer — about six days — because sperm can survive in the body for up to five days. That's why the days leading up to ovulation matter as much as the day itself for conceiving.
What if I have no signs of ovulation?
Signs vary a lot from person to person, and missing one doesn't mean a problem. But if you're tracking carefully and see no fertile signs across several cycles — no mucus changes, no temperature shift — or your cycles are very irregular, it's worth speaking to a healthcare provider, as it can point to cycles where ovulation isn't happening regularly.

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