I think we have to understand our body language when we are pregnant. When i was having acid reflux or heartburn, I mistook it for hunger and then I was thinking, I couldn't be very hungry in a matter of 15mins..cos i always time at 2hrs interval to snack or munch on something. This is to aid digestion.
So when i start to vomit acid taste liquid, and I felt bloated and stomach upset all, I then knew it wasn't hunger.. So i watched over what I eat and the interval times to avoid gastric or heartburn.