How to Tell When You’re Ovulating

October 28, 2025

2 min read

Knowing the exact time of ovulation is important for both those who dream about having a baby and those who do not want to get pregnant. How can you determine ovulation as accurately as possible?

Key takeaways

Knowing the exact time of ovulation is important for both those who dream about having a baby and those who do not want to get pregnant.
Home methods
The medical approach

Who this is for

People exploring Women's health through women health, gynecology.

Why it matters

This piece helps you get oriented quickly, then move into a collection or series if you want to keep going.

Article author

Dr. Helene

obstetrician-gynecologist

Home methods

Measuring the basal temperature: this is best done in the morning when you should measure the temperature in the anus. While there is no ovulation, it will be 97–97.3 °F, and at the beginning of ovulation will rise to 98.2–99 °F (in rare cases and higher). The downside: any inflammatory process in the body will also cause the temperature to rise.

Mobile apps: you mark the first day of your period in an electronic calendar, and based on this the app calculates the days of ovulation and the expected date of your next period. The downside: the menstrual cycle is affected by many factors — for example, stress, an acute respiratory infection, a change of time zones, a flight, and more. Therefore, you can use your data only as a reference point, which requires additional confirmation.

Ovulation test: its operating principle is similar to the pregnancy test: the test strip is impregnated with a compound that reacts to the hormonal status. The test is dipped in urine, and at ovulation, it shows two lines. The downside: the tests often give false-negative results if improperly stored or if an expired reagent is used.

The medical approach

Folliculometry is a series of ultrasounds of the ovaries, tubes, and uterine cavity: the doctor will record the stages of development of the follicle and be able to say exactly when the optimal time for conception (or conversely, the days when it is better to observe sexual rest, so that conception does not occur). It usually requires 3–5 studies: on the 9–11 days of the cycle, and then every two days before ovulation. Ultrasounds can be done trans-abdominally or transvaginally. The optimal method will be chosen by the doctor in advance.

The absence of ovulation for 1–3 months in women under 35 years of age does not indicate anything about their fertility and health alone. But if ovulation does not occur for longer than 3 months, then it makes sense to see a doctor. At older ages, intervals maybe 6 months or even more.

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