If a pregnant woman experiences some of the sensations that occur before menstruation, such as obvious abdominal pain or an obvious falling sensation, it is very likely to be a manifestation of pre-menstrual abortion. Because normal pregnant women should not have this kind of falling sensation or menstrual sensation, generally it may be some external environmental influences, the body’s progesterone is low, the human chorionic gonadotropin growth is slow, caused by the first sign of miscarriage, need to be examined as soon as possible in the hospital. The pregnancy sac in the uterus can be examined by ultrasound to find out whether there is obvious bleeding around the sac, and at the same time, the blood of the body needs to be tested, mainly to check whether the progesterone and human chorionic gonadotropin are in the normal range. If there is a significant low, can be supplemented by timely progesterone or dextroprogesterone to protect the fetus, and usually must pay attention to rest, never strenuous exercise.