The possible causes of abdominal pain like menstrual cramps in early pregnancy include: 1, abdominal pain caused by uterine contractions induced by strenuous exercise, physical labor or stimulation of sexual life. If the symptoms are serious and may cause miscarriage, you need to go to the hospital as soon as possible. 2.Symptoms of pre-miscarriage, usually accompanied by abnormal bleeding in the vagina, when this phenomenon occurs, you should go to the hospital as soon as possible under the escort of your family members for systematic examination and clear diagnosis and then fetal preservation treatment. 3.Some women may have this symptom caused by ectopic pregnancy, often accompanied by If the abdominal pain is clearly caused by ectopic pregnancy, surgical treatment should be carried out as soon as possible.