Abdominal pain in early pregnancy can be physiological or pathological, and pregnant women need to pay attention to identify it. The 15 weeks of pregnancy belongs to the early stage of pregnancy, and the vague pain in the stomach in the early stage of pregnancy can be divided into the following cases, firstly, it is an adaptive reaction in the early stage of pregnancy. With the development of the embryo, some patients have vague pain in the lower abdomen due to the gradual enlargement of the uterus, which is a normal physiological phenomenon. However, the duration of this adaptive pain is relatively short and mild, and most patients can tolerate it without special treatment. The second is the sign of preterm abortion. When lower abdominal pain occurs early in pregnancy, the patient may experience a miscarriage. The pain is paroxysmal and intensifies over time, accompanied by vaginal bleeding and other symptoms. When this pain occurs, the patient needs to go to the hospital in time to identify the cause of the abdominal pain and, if necessary, to be hospitalized for fetal preservation. Therefore, when there is a vague pain in the stomach in early pregnancy, the patient needs to assess the duration of the pain and the degree of pain. If necessary, it is necessary to seek medical attention in time to avoid delaying the condition and leading to miscarriage.