Many other conditions can cause abdominal pain, whether you're pregnant or not. Some of the most common causes of abdominal pain that your practitioner will consider are a stomach virus, food poisoning, appendicitis, kidney stones, hepatitis, gallbladder disease, pancreatitis, and bowel obstruction.
Both gallbladder disease and pancreatitis are often a result of gallstones, which are more common during pregnancy. The pressure of the growing uterus on previously scarred intestinal tissue may cause bowel obstruction. It's most likely to occur in the third trimester.