Heartburn help!!

I have the worst heartburn! I eat one or two bites and it starts instantly. I even get it from drinking just a glass of water. I've been eating tums but it only last 20min and then I'm miserable again. I feel like I'm not getting enough to drink or eat because of it...does anyone have any suggestions? Natural remedies they do. I'm not a big medicine person, and even more so during pregnancy.