You can have intercourse during pregnancy, but be gentle to avoid inducing miscarriage, premature birth, premature rupture of the fetal membranes and other situations. The first trimester of pregnancy is the most sensitive trimester for the embryo and is susceptible to miscarriage induced by various adverse factors, so it is better not to have intercourse. 2. If there are clinical manifestations of pre-eclampsia and preterm labor during pregnancy, it is better not to have intercourse for the time being. 3. Ultrasound suggests placenta praevia, which is likely to cause bleeding at the edge of the placenta after intercourse, so it is better not to have intercourse. 4. Unexplained abdominal pain and vaginal bleeding, abnormal fetal position, such as breech position and transverse position. 5. In case of unexplained abdominal pain and vaginal bleeding, abnormal fetal position, such as breech position and transverse position, etc. 5.During the acute attack of vaginitis, such as mycosis fungoides, bacterial vaginitis, trichomoniasis, etc., do not have intercourse.