In the third trimester, if there is a vague pain in the stomach, you need to consider the following possibilities: In the first case, consider that it is related to uterine contractions. During pregnancy, if the pregnant woman does not rest well and her condition is unstable, causing uterine contractions will lead to stomach pain. This situation may lead to pre-miscarriage. It is recommended to take a good rest and at the same time, ultrasound or vaginal examination can be done to understand the condition of the cervix. In the second case, some pregnant women may experience stomach discomfort in the middle of the process of uterine enlargement. In the third case, gastrointestinal cramps should be considered. After pregnancy, the uterus increases significantly, which will cause the position of the organs in the abdominal cavity to move, especially the intestinal canal, and if intestinal cramps occur during pregnancy, it will cause stomach discomfort.