When you are in full-term pregnancy, stomach pain for three hours and then no pain may be the development of false contractions, or it may be a sign of pre-labor. 1. False contractions: If the stomach pain is not serious, there is no obvious pattern, and the pain stops after three hours, false contractions may have occurred. In the later stages of pregnancy, the uterus is stimulated may produce false contractions, which is normal. 2. Signs before labor: Generally, before labor, there may be a period of irregular contractions, and as time passes the contractions may gradually become regular. In this case, you can first observe for a period of time, if the contractions begin to appear again, and the interval is getting shorter and shorter, it is considered to be about to give birth. Pregnant women need to maintain a good lifestyle, exercise appropriately, and seek prompt medical attention if any discomfort arises.