Heartburn or Gallbladder? 30 Weeks

Over the last few weeks, I have been experiencing some severe heartburn. It starts in my chest and goes all the way to my upper back. No amount of changing positions, sipping water, or eating tums is helping. Now I'm reading that it could also be a gall bladder issue? (Thanks Dr Google...) When would you all recommend calling the doctor? I don't want to go in just for them to say it's heartburn, but I don't want to ignore a serious problem. Anyone have any advice?

Thanks !