If the pain is not obvious and there are no other accompanying symptoms, it may be a normal physiological phenomenon because the uterus is increasing in size with pregnancy and pulling the ligaments around the uterus causing pain. At this time, you can take rest in the left side position to reduce the pain of the ligaments pulling on the uterus. The first thing you need to do is to rule out preterm labor and digestive system diseases, and then treat the cause. 1. preterm labor: if your stomach hurts and is accompanied by contractions or vaginal bleeding, and your stomach is tight, it may be preterm labor, so you should go to the hospital for examination and, if necessary, for fetal preservation treatment. Due to the short period of 28 weeks, the fetus is not fully developed, the survival rate of the born fetus is low, and there may be other complications, it is recommended to extend the pregnancy time; 2, digestive system diseases: inattention to diet, overeating or unclean diet during pregnancy can lead to acute gastroenteritis or gastrointestinal dysfunction, with vague stomach pain, and in severe cases, diarrhea and change in stool properties. Pregnant women can improve their gastrointestinal symptoms through dietary modifications. If the symptoms worsen, it is recommended to seek medical advice and take anti-diarrheal and gastrointestinal flora medication as prescribed by the doctor. During pregnancy, you should pay attention to a reasonable diet structure, moderate exercise, pay attention to rest, and seek medical attention at any time if you have uncomfortable symptoms, do not delay, so as not to affect the development of the fetus.