Intercourse is not recommended in the first and second trimesters of post-transfer pregnancy. After IVF, i.e. embryo transfer, patients are generally required to take proper rest and avoid strenuous exercise, but bed rest is not advocated. At the same time should relax and maintain a good state of mind, which is conducive to embryo implantation and pregnancy. Intercourse orgasm can cause uterine contraction, which is not conducive to embryo implantation or makes the already implanted unstable embryo prone to miscarriage or preterm delivery. Therefore, after transfer, intercourse is not recommended during the first and second trimesters of pregnancy. After the third trimester and before the sixth month of pregnancy, intercourse is allowed during this period, but care needs to be taken to avoid causing miscarriage.