Z.B.
My mom and I both had really bad heartburn throughout our pregnancies. It sucked!!! Personally, I opted for the prescription drugs (40 mg/day of Pepcid).
I found eating a small amount throughout the day helped. Lots of crackers and pretzels. My mom said celery helped her.
I understand your wanting to find a more natural remedy, but if your OB wrote you a prescription, it IS safe for baby! I really don't see how there's an up-side to being miserable. Especially when such an easy answer is right in front of you.