When you are 31 weeks pregnant, if you have a stomach ache, it is usually a relatively normal phenomenon. This is because at this time the fetus is gradually growing, and the uterus will also gradually grow. This will cause the uterus to press on the neighboring tissues and organs, thus causing abdominal pain. In addition, in the late stages of pregnancy, frequent pseudo-contractions are likely to occur, which is also likely to cause such a phenomenon, of course, we should also be vigilant about the cause of some infections, the maternity examination work should not be delayed. The 31 weeks of pregnancy belongs to the second trimester, every day there is a hardening of the stomach phenomenon, considering that it is due to false contractions caused by the second trimester as the baby continues to grow, it will cause false contractions phenomenon. This is also a common phenomenon in the second trimester, and there is no need to worry too much. If you have contractions again, you can lie down and rest properly, as long as you don’t have regular abdominal pain and vaginal redness, it’s not a problem.