Symptoms of miscarriage are mainly lower abdominal pain and vaginal bleeding, which vary according to the week or month of pregnancy. If the miscarriage occurs in the early stages of pregnancy before the 50th day, the symptoms of spontaneous abortion usually include vaginal bleeding, and abdominal pain will not be obvious. If the pregnancy is more advanced and a spontaneous abortion occurs, the lower abdominal pain will be more obvious, and there will also be vaginal bleeding.