How many days after ovulation will menstruation occur?

The menstrual cycle refers to a woman's monthly bleeding period, which usually lasts 3-14 days, but every woman's cycle is different. Some women may have their periods a few days early or late, which is called menstrual cycle irregularity.

So, how to calculate a woman’s menstrual cycle and ovulation period? Generally speaking, the number of days in a woman's menstrual cycle can be calculated from their birthday. For example, if a woman's birthday is on January 1st, their cycle will be 28 days.

A woman's menstrual cycle is affected by many factors, including diet, exercise, stress, and more. Therefore, calculating a woman's menstrual cycle and ovulation is not always accurate. If women are unsure about their cycle or ovulation, it is recommended that they consult a doctor or professional counselor.