The chances of pregnancy are very high when you have intercourse on the fifth day after your period. Normal menstruation time is 3-7 days, the normal menstrual cycle is 21-35 days, menstruation if 13 days to clean, to the fifth day of the fifth day is the eighth day of menstruation, but also into the ovulation period. Because the sperm survives for a longer period of time, up to five days, intercourse at this time can cause pregnancy. If the period can be cleared for seven days, wait until the fifth day after the period is cleared, it will be the day of ovulation, and the chances of pregnancy will be higher at this time of intercourse. If you don’t have the requirement to have children, no matter when you have intercourse, you must take effective contraceptive measures to avoid unwanted pregnancy.