Heavy bleeding in the early stage of pregnancy may be a kind of inevitable miscarriage. There are many reasons for inevitable miscarriage, most of which are caused by the abnormal development of the fetus itself, which may be due to fetal developmental abnormality; or fetal chromosomal abnormality; or the uterus itself, with inflammation of the endometrium, uterine fibroids, uterine adenomyosis, and all these reasons may cause inevitable miscarriage. Hemorrhage must go to the hospital as soon as possible for purging treatment, if it takes a long time, some people will suffer from hemorrhagic shock, which has a more serious effect on the body. The presence of an inevitable miscarriage in the early stages of pregnancy is a method of natural elimination and may be the reason why birth control can be successful.