For women with regular periods, ovulation usually occurs about 14 days before the next period. The risk period is 4-5 days before and 4-5 days after the day of ovulation. If a woman does not want to have children during this period, she should try to avoid having sex during the risk period, or use condoms or birth control pills to have sex during the risk period. If a woman is fertile, she should try to have sex during this period, as the conception rate is usually very high during this period. Women’s safe period is not safe, because women’s ovulation is affected by a variety of factors, such as recent mental stress, emotional fluctuations, work, life, study pressure, etc., may occur in women ovulation advance or push back, so women’s safe period is not safe.