Irregular pain in the small stomach at 36 weeks of pregnancy, there may be irregular uterine contractions, which is a symptom of preterm labor, and needs to be treated with birth control. 36 weeks pregnant, this time the fetus is not yet mature, once the production is even premature labor, the impact on the fetus is relatively large. If you feel irregular pain in your stomach, you may experience irregular uterine contractions, which is a sign of impending labor. Some of the symptoms of preterm labor, you need to use some drugs under the guidance of the doctor to inhibit uterine contractions, to protect the fetus, such as intravenous infusion of magnesium sulfate or ritodrine hydrochloride and other drugs, but during the period of use of the drug should be closely observed the adverse effects of the drug. During the period of fetal preservation, we should pay attention to the observation of fetal movement, pay attention to do fetal heart monitoring, need to rest in bed, the pressure should not be too much, and need to keep the bowel movement.