Signs of Ovulation: What Your Body Shows, and How Reliable It Is

Ovulation is the moment a mature egg leaves the ovary, and your body gives off a few clues around it. Some clues appear before ovulation, when sex is most likely to lead to pregnancy. Others appear only afterwards. Knowing which is which turns a list of vague symptoms into a plan you can act on.

What are the signs of ovulation?

The main signs of ovulation are changes in cervical mucus, a surge of luteinizing hormone (LH) that a urine test can detect, and a small rise in resting body temperature after the egg is released. Less consistent signs include one-sided pelvic pain, a higher sex drive, breast tenderness, bloating and light spotting.

1. Cervical mucus becomes clear and slippery

As estrogen rises before ovulation, the cervix makes more mucus, and it turns thin and slippery.¹ After ovulation it drops off and becomes thicker and less noticeable.¹ In a study of 73 cycles, the mucus symptom began an average of 5.9 days before estimated ovulation, and the last day of slippery mucus fell within two days of ovulation in 95.4% of normal cycles.²

Mucus is one of the best free signs you have. In 107 women who also had daily ultrasound, clear, slippery or stretchy mucus identified the six-day fertile window with 96% sensitivity.³ ASRM notes that slippery, clear mucus is linked to the highest chance of conception, though it is not required for pregnancy.⁴ Our cervical mucus guide explains how to check it and what each stage means.

2. An LH surge on an ovulation test

A surge of LH from the pituitary gland triggers the follicle to release the egg. Urine ovulation tests detect it. In 40 women whose ovulation was confirmed by ultrasound, the urinary LH surge came before ovulation in every case, by an average of 0.81 days.⁵ ASRM notes ovulation may happen any time within the two days after a detected surge, and that false-positive results occur in about 7% of cycles.⁴

That lead time is what makes LH tests useful: the best days for sex are the two before ovulation. See how long after an LH surge you ovulate for timing, and how to read an ovulation test for the results.

3. A rise in basal body temperature

Your resting temperature typically rises about 0.5 to 1°F around ovulation and stays higher until your next period.¹ Because the rise comes after the egg is released, ACOG notes it shows when ovulation has already occurred, not when it is about to.¹ The most fertile days are the two to three days before the rise.¹

Temperature is easy to disrupt. Fever, alcohol, stress and poor sleep all shift it, and in one study cited by a 2017 review, the temperature shift lined up with the LH surge, give or take a day, in only 22.1% of cycles.⁶ Charting is still valuable over several cycles to see whether, and roughly when, you ovulate.

4. Mid-cycle pain (mittelschmerz)

About one in five women have pain around ovulation, according to MedlinePlus.⁷ It is usually on one side of the lower abdomen, lasts minutes to a few hours, and sometimes up to 24 to 48 hours.⁷ A clinical review estimates it may affect over 40% of women of reproductive age, and notes that the pain tends to coincide with the LH peak, before the follicle ruptures.⁸ That makes it a hint that ovulation is near, not a precise timer. Read more in does ovulation cause cramps?

5. A higher sex drive

Desire may rise naturally in the fertile days. In a study of 68 women whose ovulation was measured with urine hormones, sex was 24% more frequent during the six fertile days than on other non-bleeding days, even though none of the women were trying to conceive.⁹ It is a real effect on average, but too subtle to rely on in any single cycle.

6. Breast tenderness, bloating and other changes

Cleveland Clinic lists tender breasts, bloating, mood and appetite changes, and a heightened sense of smell or taste among possible ovulation symptoms.¹⁰ Many of these overlap with premenstrual changes later in the cycle, so they rarely tell you which day you ovulated.

7. Light spotting

Some people see a little spotting around ovulation, but it is uncommon. In the BioCycle Study of 201 regularly menstruating women, only 4.8% had any mid-cycle bleeding.¹¹ Heavy or repeated bleeding between periods should be checked by a clinician.

How to confirm you actually ovulated

The surest home confirmation is a progesterone signal after the LH surge. In the ultrasound study above, the urine progesterone metabolite PdG rose from baseline after ovulation in every volunteer, peaking a median of 7.5 days later.⁵ A sustained temperature rise also points the same way. Fertility monitors that read LH, estrogen and PdG on one device combine prediction and confirmation.

When signs suggest you may not be ovulating

Very irregular or absent periods, or cycle after cycle with no LH surge and no temperature or PdG rise, can mean ovulation is not happening regularly. With PCOS, for example, high androgen levels can prevent the ovaries from releasing an egg each month.¹² A clinician can check this with blood tests and ultrasound. For the full picture of when to test and when to try, see the fertile window guide and the Try hub.