When threatened miscarriage occurs, pregnant women often experience vaginal bleeding and abdominal pain. However, at this time, the fetal heartbeat and embryo are generally still in good condition, and timely treatment to preserve the pregnancy can be effective. But if the patient experiences a significant amount of bleeding and severe pain, accompanied by backache and a sense of heaviness, it may indicate a threatened miscarriage. It is advised to go to a hospital for an ultrasound examination and to have blood tests to check progesterone levels to determine if treatment to preserve the pregnancy is needed. If, after such treatment, vaginal bleeding stops and abdominal pain disappears, then the pregnancy can typically continue.