There is no need for contraception during pregnancy, because when a woman is pregnant she will not ovulate again due to changes in hormone levels and cervical mucus will prevent sperm from bonding with the egg, so even if you do have intercourse, you will not get pregnant again. However, there are certain restrictions on coitus during pregnancy.1. Pay attention to the period: coitus is prohibited before the 12th week of pregnancy and after the 28th week of pregnancy. Throughout the pregnancy, the first 12 weeks is an important period of embryonic and fetal development, maturity, external interference factors may lead to miscarriage; after 28 weeks of pregnancy, fetal weight began to grow rapidly, contractions are more intense, frequent, the fetus is vulnerable to external influences in advance of delivery. Therefore, couples should avoid coitus during the above time. 2, sexual hygiene: when coitus during pregnancy, we should also pay attention to sexual hygiene, if the male sexual organ is not clean, it may cause inflammation of the reproductive tract, so it is recommended to wear a condom. 3, gentle movements: men should pay attention to the strength, gentle movements, to avoid abdominal pressure, to reduce the impact on the baby. If there are special circumstances such as placenta praevia, coitus should be prohibited.