For women with regular menstrual cycles, ovulation is around the 14th day before the next menstrual period. Ovulation is five days before and four days after the day of ovulation. For women who want to prepare for pregnancy, they can master the ovulation period and have intercourse during the period to increase the chance of pregnancy. For women who have irregular menstrual cycles and are uncertain about the time of ovulation, they can initially determine the date of ovulation based on symptoms. Women may experience elevated body temperature, mild abdominal pain, leucorrhea in the form of straining and slight vaginal bleeding during ovulation. Women who want to use contraception should pay more attention during ovulation and take contraceptive measures to prevent unwanted pregnancy. For women who want to have children, they can use ovulation test strips from the tenth day of menstruation or monitor ovulation by ultrasound and arrange intercourse in time when ovulation is detected.