If you experience stomach pain after having intercourse in early pregnancy, the pain is mainly caused by the contraction of the smooth muscle of the uterus after orgasm, and the possibility of pre-eclampsia is considered. If there is also abnormal vaginal bleeding, it is necessary to go to the hospital for examination in time, and if it is confirmed that the embryo continues to survive, treatment can be carried out with drugs to protect the fetus, such as Didrogestrel and Fertility Pill. Patients should not have sexual intercourse anymore, and it is recommended to do so after three months, and they should pay attention to the intensity of the intercourse, preferably not to reach orgasm, which may also cause uterine contractions and lead to miscarriage. If intrauterine pregnancy is not confirmed in the early stages of pregnancy, the possibility of ectopic pregnancy cannot be ruled out even if the stomach pain occurs after orgasm, so further investigation is needed.