Is ovulation 13 days before menstruation?

In fact, scientific research shows that any point in the menstrual cycle may be considered ovulation. For most people, ovulation occurs on day 14 of the menstrual cycle, but it can also be on day 13 or 15. However, this depends on a woman's menstrual cycle and fertility.

In addition, a woman’s menstrual cycle is not fixed and is affected by many factors, including diet, exercise, stress, and more. Therefore, accurately predicting a woman's menstrual cycle and ovulation period may be affected by many factors, so it is not possible to accurately predict the ovulation period on a certain day.

Although you can't accurately predict which day will be your ovulation period, you can monitor your fertility through some methods. For example, you can use the method of measuring basal body temperature to monitor changes in a woman's body temperature, or use a calendar or calculator to calculate a woman's menstrual cycle and ovulation period.