Depending on how far along you are, you might be experiencing a burning like feeling similar to acid reflux. With pregnancy your body is increasing your hormone levels and this may also relax the lower esophageal sphincter, or valve that keeps stomach acid from traveling upward. When the valve isn’t working right the acid travels up and irritates your esophagus causing heartburn.
The good news is that this should go away after you deliver. Tums help, but be careful how many you take; they do have calories and sugar.
A Dusty Diamond,