Some pregnant women in the fertilized egg will appear in the lower abdomen that is small stomach pain, is a normal phenomenon; can also be seen in the aura of miscarriage, ectopic pregnancy and other abnormalities. 1, the fertilized egg implantation pain: the fertilized egg in the female fallopian tube after the formation of the need to move to the uterus, and then in the uterine cavity to choose the appropriate location, planted in the endometrium that is, implantation. Fertilized egg in the process of bedding will destroy the endometrium, some pregnant women at this time will appear in the lower abdomen pain, mostly mild, can be accompanied by a small amount of vaginal bleeding, mostly occur in the fertilized egg formation 2-3 weeks, is a normal phenomenon. If the pregnant woman has been determined intrauterine pregnancy, small stomach pain, mainly consider the physical abdominal pain caused by pregnancy. 2.Abnormalities: (1) Pre-eclampsia or miscarriage: it can cause lower abdominal pain, manifested as prolonged and progressive aggravation of pain in the lower abdomen, or accompanied by vaginal bleeding. (2) ectopic pregnancy: ectopic pregnancy in the occurrence of miscarriage or rupture, can also appear in the lower abdomen pain, often manifested as persistent lower abdominal pain on one side, abdominal pain feeling gradually strong, and even fainting. If the intrauterine pregnancy is not identified pregnant women, the side of the abdomen pain, need to be alert to the possibility of ectopic pregnancy, and should go to the hospital as soon as possible, a clear diagnosis. (3) Other diseases: If pregnant women test positive urine test at home by themselves, it does not exclude the possibility of false-positive, and it does not exclude the pain in lower abdomen caused by gastroenteritis, pelvic inflammatory disease, appendicitis and so on. To summarize, some pregnant women may experience lower abdominal pain in the early stage of pregnancy, which is mostly relieved after rest. If the pain is not relieved or aggravated, accompanied by vaginal bleeding and other symptoms, it is necessary to consult a doctor for a clear diagnosis.