Contractions are not regular but stomach pain may be related to overwork, false contractions and labor. 1. Overwork: Overwork during pregnancy can cause contractions and stomach pain, especially in late pregnancy, you must avoid strenuous activities and overwork to prevent contraction reactions. 2. False contractions: a physiological phenomenon, there will be contractions, but usually do not have a particularly pronounced abdominal pain, the stomach will have a feeling of tightness, swelling. 3. Prolonged labor: stomach pain in late pregnancy may be a harbinger of labor, although the contractions are not regular, may gradually become regular with the passage of time, and need to pay attention. It is recommended to go to the hospital for examination and treatment according to the actual situation.