If you have intercourse on the 5th day after your period, you may have an unwanted pregnancy if you are not using contraception. If you are not planning to have a baby, you should take emergency contraceptive pills within 72 hours or place an intrauterine device to prevent pregnancy. If you are planning to have a child, you can observe for the time being. Although it is physiologically safe to have a clean period of 5 days, the safe period is not absolutely safe. After the period is clean, pay attention to keep the vulva clean and hygienic. If you want to have children, you should have a eugenics and health checkup, if there is no abnormality, you can take oral folic acid in advance to prevent the occurrence of fetal neural tube malformation. The chances of conception can be improved by having intercourse during the ovulation period, and both men and women should maintain a good work schedule before getting pregnant.