Are you nausios? Is the pain spreading to your shoulders or back? Your gallbladder is located in the area you are describing and gallstones are common in pregnancy.
Have you had a lot of heartburn? If so, it could be that your stomach acid has irritated your esophagus. That is what is happening to me. My doctor had to prescribe me an antacid that is stronger than tums and helps stop the producing of stomach acid,