Natural Remedies for an upset stomach?

Scarlett • Hello there. My name is Scarlett. I'm 24 years old, married, and expecting my first in March.
My stomach has been feeling funky, lately. I developed indigestion/acid reflux during pregnancy, didn't have it beforehand.
I take Alka-Selzter Chewables, which work well. Tums didn't work at all.
What food or drink could I consume to ease an upset stomach? DIY or store-bought suggestions?