The stomach pain in the fourth month of pregnancy, painful and wanting to defecate, indicates a feeling of falling, which may occur when there are signs of miscarriage in general, and will show stomach pain, falling, and a feeling of anal cramping, and uterine contraction spasms. During this period, you should pay attention to bed rest, relax and do not overstress. If the pain in the stomach worsens, you should promptly go to the hospital for an ultrasound examination to rule out whether there are signs of miscarriage. If it is determined that the contraction is caused by the uterus, the stomach drop should be promptly controlled with birth control drugs to avoid serious stomach pain leading to miscarriage or affecting the growth and development of the fetus, and try to pay attention to not violent bumps.