If there are no obvious external factors (external impact on the abdomen, work strain), the main consideration is the physiological abdominal pain caused by the enlarged uterus pressing on the surrounding organs and the uterine ligament pulling, sometimes accompanied by physiological contractions, which is a normal physiological phenomenon; but at the same time, we should pay attention to the late preterm abortion. At 15 weeks of gestation, the fetus and placenta are relatively stable and the risk of late preterm abortion is significantly reduced if there is no obvious cause (12-28 weeks is called late abortion). After 10 weeks of pregnancy, a large amount of human chorionic gonadotropin, estrogen and progesterone needed to maintain pregnancy are mainly synthesized and secreted by placental cells (estrogen and progesterone are mainly produced by ovarian corpus luteum or gestational corpus luteum until 8-10 weeks), so late preterm abortion is mainly considered as placental malfunction, mostly due to congenital underdevelopment of the fetus, and conventional progesterone treatment is ineffective in this case. If the ultrasound indicates that the fetus is developing normally, and the abdominal pain is mild, without vaginal bleeding and other symptoms, the main consideration is physiological abdominal pain after pregnancy, often accompanied by frequent urination, and sometimes physiological contractions, which is a normal physiological phenomenon. This is a normal physiological phenomenon. It may be triggered by the rapid enlargement of the uterus (uterine congestion and thickening of the muscle wall) due to the embryonic implantation, further growth and development of the fetus and placenta, compression of the surrounding organs, physical pulling of the uterine ligaments and changes in hormone levels in the body leading to accelerated metabolism in the body. At this time, we should avoid squatting and bending, pay attention to maintenance, prevent cold, eat less spicy and sour food, and apply hot compresses locally, which can be effectively regulated. If there is no abnormality, then consider the physiological abdominal discomfort, take proper rest and pay attention to the abdominal pain regression.