Miscarriage is divided into preterm miscarriage, incomplete miscarriage and complete miscarriage. In case of preterm miscarriage, there is usually brown discharge with exceptionally small amount of blood. After fetal preservation, medication and symptomatic treatment, most of them can be preserved and there is no great impact on the embryo. In case of complete miscarriage, the amount of bleeding basically reaches the amount of menstruation, the gestational sac will be expelled intact, bleeding for about seven days, similar to the symptoms of menstruation, and most of them are not too affected. Two weeks after the miscarriage, the ultrasound will be repeated, and if there is no abnormality, there is no need to remove the uterus. In case of incomplete miscarriage, the bleeding is more, sometimes more than the amount of menstruation. If it is significantly more than the amount of menstruation, you need to go to the hospital immediately for ultrasound examination. After the diagnosis of incomplete miscarriage, you need to clear the uterus immediately to reduce the amount of bleeding and prevent excessive blood loss.