In women with regular menstruation, ovulation usually occurs 14 days before menstruation, and the 5 days before and 4 days after ovulation are both part of the ovulation period, which is about 10 days long. In women of childbearing age with normal ovarian function, ovulation occurs cyclically with changes in hormone levels in the body. For women with regular menstruation, ovulation usually occurs 14 days before the next menstrual period, and the 5 days before and 4 days after the day of ovulation are called the ovulation period. For women with irregular periods, you can use ovulation test strips and ultrasound examination to determine the day of ovulation and project the ovulation period. Couples who have intercourse during this period have a higher chance of conceiving. If you have no plans to have children, you should take necessary protective measures such as using condoms and oral contraceptive pills during this period. In addition, emotions, diet, lifestyle and other factors can affect the time of ovulation, so unexpected ovulation may occur outside of the ovulation period, so it is not recommended to adopt the method of safe period contraception.