If it is a natural miscarriage, and the embryo is expelled completely, there is generally bleeding for about three days, accompanied by a small amount of bleeding or a small amount of brown discharge. If the bleeding lasts for a long time, about three days, and the amount of bleeding is significant, it is considered possible that there might be remnants or that the uterus is not contracting properly. In such cases, it is first necessary to undergo an ultrasound examination. An ultrasound can determine the issue of remnants and how much is left. If the ultrasound shows remnants greater than 1.0 cm, surgical cleaning of the uterus is required; if less than 1.0 cm, it can be treated with medication. Then, another ultrasound will be needed to check the recovery of the uterus.