The danger period is the ovulation period, for the calculation of ovulation, you have to calculate the ovulation day first. If you have regular menstruation, the ovulation day is basically about 14 days before the next menstrual period. Four days before and three days after the ovulation day, a total of 8 days, is the ovulation period. If you have sex during the ovulation period, you have a very high chance of getting pregnant, which is the so-called danger period. If you are not planning to get pregnant, if you have sex during this period, it is recommended that you use a condom to prevent pregnancy during the entire sexual intercourse. If you are planning to get pregnant, you can arrange your sex life reasonably during this period and rest in bed for an hour after having intercourse, which will increase your chances of getting pregnant.