Hi Janna! I was on Prenate (the purple ones) before I got pregnant, and until I couldn't stand them anymore (I know what you mean about gross burps). So, my doc. put me on a chewable vitamin called Precare, and they were good, but I ran out of samples and have to get a prescription. She also said that if they didn't agree with me that I could take 2 Flinstones vitamins a day, and they would work the same way. My DH bought me some Flintstones until I get the prescription filled (I send away for my pres). They are agreeing with me too. Good luck!
-Jen