The safe period is related to the menstrual cycle and should be projected according to the menstrual cycle. It is applicable to women with regular menstrual cycles. Ovulation usually occurs 14 days before the next menstrual period, and the 5 days before and 4 days after ovulation are usually regarded as fertile periods, while the rest of the time is regarded as safe periods. The safe period is usually calculated based on the date of ovulation. It is suitable for women with regular menstrual cycles. Ovulation usually occurs 14 days before the next menstrual period, and the 5 days before and 4 days after ovulation are usually regarded as the fertile period, while the rest of the time is regarded as the safe period. However, the so-called safe period is affected by a variety of factors, which may lead to the occurrence of safe period pregnancy. Therefore, the use of safe period contraception is not very reliable and not easy to promote. Commonly used contraceptive methods are condoms, intrauterine devices (IUDs) and short-acting oral contraceptive pills (STOPs), etc. Safe and effective contraceptive measures are used to avoid unwanted pregnancies.