Some pregnant women often have stomach pain when they have a bowel movement during pregnancy, considering the following possibilities: a. After pregnancy, due to changes in hormone levels, the gastrointestinal tract peristalsis is weakened, many pregnant women will have constipation, the prolonged presence of stool in the intestines will cause intestinal peristalsis, after active intestinal peristalsis will have abdominal pain, so pregnant women will feel abdominal pain when defecating, if this is the case after defecation abdominal pain will be relieved. Second, the abdominal pain after the late pregnancy stool is false contractions, to the late pregnancy abdominal space becomes smaller, bowel movements may stimulate the uterus to induce contractions, if the pain occasionally once or twice and the pain is relatively mild, you can temporarily observe, if the pain is more serious need to go to the hospital in time for examination.