Threatened miscarriage is not actually a miscarriage. If handled properly, it is possible to successfully preserve the pregnancy. However, if not treated in time, it could develop into an inevitable miscarriage. During a threatened miscarriage, the fetal heartbeat and embryonic tissue are generally normal, and there may be minor vaginal bleeding or slight lower abdominal pain. At this time, it is crucial to go to the hospital for an ultrasound and have blood tests for progesterone and human chorionic gonadotropin. If the fetal heartbeat and embryo are normal, then treatment to preserve the pregnancy is needed. At this time, it is important to rest, reduce activity, and avoid any vigorous exercise.