The number of days after menstruation to ovulate depends on the regularity of a woman’s menstrual cycle and the specific number of days in her menstrual cycle, which needs to be analyzed on a case-by-case basis and cannot be generalized. For women with regular menstrual cycles, for example, if the menstrual cycle is 30 days long, the ovulation day is usually 14 days before the next menstrual period, which is a fixed time. Therefore, if a woman’s menstrual period lasts for 7 days, she may ovulate around 9 days after the end of her period; if she has a short menstrual period of only 3 days, she may ovulate around 13 days after the end of her period. However, in the case of women with irregular menstrual cycles, it is usually impossible to project the ovulation day by the above method. You can go to the gynecology department of the hospital for ovulation monitoring to know the timing of ovulation. When ovulation occurs, the female organism will also produce some changes, such as increased leucorrhea, pain in one side of the abdomen and increased basal body temperature. If you have a plan to prepare for pregnancy, you can also determine the timing of ovulation by detecting changes in body temperature, and then reasonably arrange intercourse to improve the chances of conception.