The bulge in the belly during pregnancy is clearly distinguishable from contractions. The bulge is caused by the fetus moving inside the uterine cavity and the limbs moving against the uterus, resulting in a bulge on the surface of the abdominal wall. The position of the bulge is variable, and it does not occur at the same time in the whole belly, but around the fourth month of pregnancy, when the fetus is moving around in the uterus, the phenomenon of bulging begins. The contractions are pseudo contractions and real contractions in late pregnancy. The contraction of the uterus will result in tightness and hardness of the stomach, and the whole stomach will appear at the same time, not here and there, and when there is a contraction, it will also show pain in the stomach or a feeling of falling.