After pregnancy, it is usually okay to have sex between the 4th and 6th months of pregnancy. Because the fetus is relatively stable at this stage, it is generally okay to have sex properly. However, the number of sexual intercourse should not be too many, but also pay attention to the intensity of sexual intercourse to avoid pre-miscarriage. If the pregnant woman has high-risk factors, such as low placenta, placenta praevia, and symptoms of pre-eclampsia, or if the fetus is particularly difficult to obtain and has vaginal inflammation, it is recommended not to have sex. These high-risk factors can cause bleeding after sex and lead to miscarriage. During the early trimester and late pregnancy, intercourse is not allowed because it increases the risk of preterm labor and miscarriage.