When you have a stomachache during pregnancy, it depends on the location and nature of the abdominal pain. If the pain is in the small abdomen and is mild, it is normal because after pregnancy, the uterus gradually increases in size and weight, and the ligaments that hold the uterus in place can be stretched to cause mild pain, which can appear as soreness or swelling and is a normal physiological phenomenon. If there is pain in the side of the abdomen, you should be alert to the possibility of tubal pregnancy in early pregnancy and see your doctor for an ultrasound examination 10 days after the cessation of menstruation. If the pain is severe, you should be alert for acute abdominal problems such as ectopic pregnancy rupture or corpus luteum rupture. If the pain is accompanied by increased leucorrhea, yellowish color or odor, you should be alert to gynecological inflammation.