I had terrible heartburn with my two girls starting in the second trimester. Tums didn't help me so my doctor suggested trying one of the OTC heartburn medications. I tried Prilosec (which he made sure was safe) and it worked great! I would get heartburn and reflux from almost everything I ate, so mine was really awful. Check with your doctor if the Tums don't work!
Tums. It works great for me :)