When women experience vague abdominal pain in early pregnancy, the following possibilities are considered: First, due to the obvious congestion of the uterus after pregnancy, while the uterus gradually grows and pulls the nearby ligaments and muscles resulting in physiological manifestations, many women during early pregnancy will have occasional abdominal pain symptoms, but the pain is relatively mild and does not affect women much. Secondly, it may be due to low progesterone level after pregnancy or poor quality of the embryo itself, resulting in pre-eclampsia miscarriage, often accompanied by a small amount of vaginal bleeding, which mostly requires fetal preservation treatment. Thirdly, the abnormal manifestation may be caused by ectopic pregnancy, because the embryo does not grow in the uterine cavity, and during the development of ectopic pregnancy, it will stimulate the local area and produce pain.