After the appearance of the fetal heart and germ, the embryo is most likely to stop developing during the first 3 months of pregnancy, i.e. fetal abortion. In the first 3 months of pregnancy, due to the short time of embryo implantation, embryonic arrest may occur due to various external factors, such as chromosomal abnormalities, reproductive tract infections, abnormal reproductive tract anatomy, endocrine abnormalities and immune factors. Embryonic arrest can be manifested as the uterus does not increase in size, early pregnancy response disappears, small amount of vaginal bleeding, or discharge of dark red bloody leucorrhea, accompanied by paroxysmal lower abdominal pain or low back pain, etc. Some patients have no obvious symptoms. If the above clinical manifestations occur in women during pregnancy, they should go to the obstetrics and gynecology department for examination and treatment in a timely manner. In addition, during pregnancy, pregnant women should regularly go to the hospital for prenatal checkups to clarify the development of the fetus and treat any problems in time.