Sounds like it might just be acid related, which is very common
in pregnancy. Are you burping a lot, have a funny taste
in the back of your throat? Does your stomach wake you at night? If so, try sleeping elevated and try taking tums and minimizing acid-causing foods in your diet. Apples and bananas are great natural acid-reducers.
Definitely mention to your doc, too. Call if it becomes too cumbersome before your next appointment or if you don't feel well.