An early pregnancy that will miscarry on the 31st day is called an early miscarriage. Termination of pregnancy at less than 28 weeks is called miscarriage and termination of pregnancy before the end of 13 weeks is called early miscarriage. If the miscarriage occurs on the 31st day of pregnancy, it is called early miscarriage. The main factor leading to early miscarriage is chromosomal abnormalities in the embryo. These include numerical abnormalities such as trisomy 21, structural abnormalities, translocations, breaks, and deletions of chromosomes. Luteal insufficiency can also lead to the occurrence of early miscarriage. Clinical manifestations of miscarriage are vaginal bleeding and abdominal pain after menopause. Early miscarriages often begin with vaginal bleeding and are followed by abdominal pain. If there are signs of miscarriage in the clinic, one should go to the hospital in time for treatment under the doctor’s guidance, and the pregnancy can be terminated if necessary.