If you have a vague pain in your stomach in the fourth month of pregnancy, you should first of all pay attention to the severity of the pain, its duration and regularity, which need to be distinguished. If the pain is only mild, it is considered to be physiological because the uterus will increase in size as the fetus grows, showing a slight pain in the stomach. After pregnancy, the uterus will rotate to the right, which will also pull on the ligaments in the uterus and cause pain. In general, this condition does not require special treatment. You should try to take rest and not to overexert yourself, and you can take rest in the left side to reduce the pain caused by the right-sided uterus. During this period, you should also pay attention not to exercise too much and keep your mood relaxed, if you are nervous or stressed, it will also easily lead to uterine contraction, leading to increased pain symptoms.