In general, when threatened miscarriage occurs, pregnant women often experience abdominal pain. This pain is usually a dull ache in the lower abdomen, similar to the pain experienced during menstrual cramps. If the symptoms of threatened miscarriage are severe and the pain is quite pronounced, miscarriage may occur. This type of pain is mainly caused by contractions of the uterus. Besides abdominal pain, vaginal bleeding often accompanies this condition, which can also lead to miscarriage. When threatened miscarriage occurs, it is essential to rest in bed, reduce physical activity, avoid emotional stress, and consider visiting a hospital for an ultrasound to observe the development of the gestational sac.