The feeling of menstruation at the beginning of pregnancy is mainly due to the gradual enlargement of the uterus and the corresponding pain in the ligaments. The pain is very mild, uncomfortable in the lower abdomen, and often disappears after rest, mainly due to the pain of ligament pulling. It is recommended to strengthen the nutrition after pregnancy, but also pay attention to rest, and do not have sex in the first three months of pregnancy. If the symptoms of menstruation become more obvious and the feeling of swelling occurs, clinically, it may also be due to luteal insufficiency or symptoms of pre-eclampsia caused by exertion, so clinically, it is also recommended to give a difference. Blood tests for HCG and progesterone can be taken at the hospital to see if the miscarriage is preeclampsia, or if there is pain in the ligaments of the enlarged uterus.