Abortion has caused a lot of harm to the body of a female friend. There is no side effect of abortion. Some friends do not want to get pregnant, and do not want to take medicine. Then they will use the safe period of contraception. Accurate and accurate measurement of ovulation can achieve the purpose of contraception. In the ovulation period, the sperm is combined with the egg. There are three small methods, which are simple and practical. First: the calendar method can be used to estimate the ovulation period and the pre-ovulation and post-ovulation safety period. However, it is only suitable for women with normal menstruation, and sometimes ovulation is advanced or delayed due to environmental changes and emotional changes, so it is not accurate enough. Second: the measurement of basal body temperature method can determine the ovulation date and the safety period after ovulation. The safety period before ovulation cannot be determined in advance. This method is troublesome and requires strict requirements. If the body temperature is not measured according to the regulations, the ovulation date cannot be accurately determined. Third: Cervical mucus observation method can measure the ovulation period and the pre-ovulation and post-ovulation safety period, and the correctness is high, but the user must be trained and fully grasped before use. Reminder: If you combine these three methods, you can use your strengths to avoid weaknesses and achieve greater results. At least one of the two parties can master the method of measuring the ovulation period. If this method is not mastered, safe period contraception cannot be used. Safe period contraception is to stop sexual intercourse during ovulation, which requires close cooperation with the man, otherwise it can not be used. Of course, it is also possible to use a topical contraceptive during ovulation. The safety period is about 10 days after menstruation, and after the 20th day after menstruation to the next menstrual cramp, the closer to the menstrual period, the greater the possibility of contraception. The time of female ovulation is affected by factors such as the external environment, climate, personal emotions, and health status. Ovulation may be delayed or advanced, and additional ovulation may occur. Therefore, the safety period cannot be considered accurate, so it is said that the contraception is not safe during the safe period.