Contraception is not necessarily needed during pregnancy as it will not allow the woman to become pregnant again, but the use of condoms will reduce the contact of body fluids and to some extent reduce the chance of infection. After pregnancy, due to changes in hormone levels, the ovaries will not ovulate again and the cervical mucus will prevent sperm from entering, so the woman will not get pregnant again in the state of pregnancy. Although you don’t need to use contraception during pregnancy, you should pay attention to the timing of intercourse. It is not advisable to have intercourse in the early and late trimesters of pregnancy, as it may stimulate uterine contractions and spasms, which may increase the chances of miscarriage or preterm delivery. If there is no abnormality in the first trimester of pregnancy, you can arrange to have intercourse in the middle of pregnancy. Avoid overly strenuous movements, and do not press the man into the woman’s abdomen, as well as abnormal vaginal bleeding and abdominal pain in the process of coitus. Because semen contains prostaglandins, absorbed by the vagina may cause uterine contractions, which may cause premature labor, so in case of emergency, it is best to use a condom during pregnancy. During pregnancy, women should pay attention to rest, avoid strenuous exercise, avoid excessive physical labor, and seek medical attention if there are any abnormal symptoms.