During pregnancy, especially around 17 weeks, pain in the upper right side of the abdomen near the gallbladder that may spread to the back may be caused by gallstones or biliary colic. Hormonal changes, especially increased progesterone, can slow down the movement of the gallbladder and make bile thicker, increasing the risk of stone formation or blockage. This pain may come after fatty meals and can last from minutes to hours. Other possible causes include gastritis, acid reflux, or liver-related conditions in pregnancy, so proper evaluation is important. She should avoid oily and fried foods, take small, frequent meals, and drink enough water. However, self-treatment should be avoided during pregnancy. If pain is severe, persistent, or accompanied by fever, yellowing of the eyes, or reduced fetal movements, please see a doctor urgently to confirm the cause and decide safe treatment during pregnancy.