There are many brands of prenatal vitamins and you can even buy them at the drugstore,so try a few different ones until you find one that your body likes.I was once told by a health nut that if you can drop a vitamin in a cup of vinegar and it dissolves in less than 30 minutes, then that vitamin will react the same way in your stomache.If it does not dissolve in that time,it has too many additives and can lead to stomache upset.Some people cannot tolerate pill vitamins and need to use the liquid form,these are often found at health food stores.Good luck to you.Patty