If you have vague pain on the right side of the small abdomen during pregnancy, it is considered to be a physiological manifestation, as the enlargement of the uterus during pregnancy may involve muscle and ligament pain. If the pain is more severe and is paroxysmal or persistent, it is considered to be pathological. If the pain is more severe due to right tubal infection or appendicitis, ultrasound examination should be done promptly to determine whether there is inflammatory infection. The more serious inflammation, appendicitis has the chance of perforation can also do surgery.