For women with regular menstruation, ovulation occurs about 14 days before the onset of menstruation. For women with irregular menstruation, the time of ovulation cannot be accurately estimated. For women with regular menstruation, the menstrual cycle usually lasts about 28-30 days, and the day of ovulation usually occurs about 14 days before the next menstrual period, with the first 5 days of the 14th day and the 4 days after the 14th day belonging to the ovulation period. For women with irregular periods, there is no clear correlation between the time of ovulation and the time of menstruation. Ovulation may occur in the middle of menstruation or at other times in the menstrual cycle. Clarifying the time of ovulation has a positive significance in preparing for pregnancy. If you need to know the details of ovulation, it is recommended that you consult your doctor in time for an ultrasound examination to monitor the follicle condition to determine the ovulation situation.