Level 1: Causes of abdominal pain in 8 months of pregnancy. Stomach pain in 8 months of pregnancy may be caused by many reasons, including physiological changes, contractions, fetal movement, infection, etc. The most common of these are contractions, which are normal as preparations begin for labor. In addition, fetal movements can also cause tummy ache because as babies grow, their internal movements become more frequent and intense. In addition, infection may also cause stomach pain. Pregnant women\’s immunity decreases during pregnancy and they are susceptible to bacterial or viral infections. If you have stomach pain accompanied by fever, vomiting and other uncomfortable symptoms