You may want to ask your dr about tums. My aunt said with her first pregnancies tums were fine. Well she recently had her fifth child and said that this time around they said tums were not good to have during pregnancy. She said that they used to be okay but have now found that they may not be. I am not sure why. I am sorry I don't have more information. I have researched what meds are okay for gas - the ingredients used in Gas-X are supposed to be fine during pregnancy, from what I researched. Feel better! I hope you find relief!