After pregnancy, some pregnant women will experience stomach pain, which may be a normal physiological reaction, but it may also be caused by pathologic reasons such as preeclampsia, ectopic pregnancy, placental abruption, and so on. 1. Physiological reasons: after pregnancy due to uterine enlargement, pelvic congestion, the ligaments of the uterus are pulled, some pregnant women will experience mild abdominal pain symptoms, usually belong to the normal physiological phenomenon, you can first observe. 2. Pathological causes: (1) Pre-eclampsia: when the symptoms of stomach pain occur within 28 weeks of pregnancy, accompanied by a small amount of vaginal bleeding, it indicates that there is a possibility of pre-eclampsia. (2) Ectopic pregnancy: Ectopic pregnancy in early pregnancy can also be manifested as pain in one side of the lower abdomen, which may also be accompanied by vaginal bleeding. (3) Placental abruption: If there is a sudden onset of pain in the lower abdomen, accompanied by vaginal bleeding and obvious uterine pressure, it indicates that there is a possibility of premature abruption of the placenta. If you experience persistent abdominal pain or severe abdominal pain accompanied by abnormal vaginal bleeding during pregnancy, it is recommended that you consult a doctor promptly.