Great Aunt refers to menstruation. For women who have more regular periods, ovulation usually begins about 7-10 days after a woman’s period has gone. For women with more regular periods, ovulation begins about 7-10 days after the period clears. If the menstrual cycle is 28-30 days long, and the average menstrual period is about 5 days long, then ovulation begins about 7-10 days after the menstrual period is cleared. This is because ovulation occurs about 14 days before the next menstrual period, which is determined by how long the corpus luteum lasts. Therefore, for those who have regular menstrual cycles and regular menstrual periods, the time of ovulation is relatively fixed, while for those who have longer or shorter menstrual cycles, the time of ovulation should be estimated according to the time of the next menstrual period. For example, for a person with a 35-day menstrual cycle, ovulation should occur around the 20th day of the period. If the menstrual cycle is 22-23 days, then ovulation will occur on the 8th-9th day of menstruation, that is, if menstruation is cleared in 5 days, ovulation will occur 3-4 days after menstruation is cleared, then for such a person we will have to extrapolate according to the actual situation. Then for a woman whose menstrual cycle is 28-30 days and whose period is 2-7 days, ovulation occurs about 7-10 days after the period is clean.