Is this heartburn or indigestion?

I know that sounds dumb, but I've never actually had either. I have had a slight warm or acidic feeling in my lower esophogus since yesterday morning. I didn't eat anything abnormal, but I did have too much to eat the night before it came on. I had plenty of water and a cup of tea before bed. I felt thirsty but very full. When I woke up, instead of feeling better like I do on the occasions that his happens, I felt like I had to burp but couldn't, and when I lay down and/or roll over, I can usually feel the "heat" rolling with me. The burp feeling hasn't really gone away either. It's not constant, and the intensity varies.
I am 35 weeks pregnant, and I know heartburn is a common 3rd trimester symptom. I'm just wondering if this is it or something more like indigestion. I had some icecream last night and it helped a little. Milk with breakfast has minimal effect. I'm trying to stay upright, but when I feel things moving I might burp, more often than not nothing happens.

It was a few hours (at least 3) after I ate that I went to bed, and I've been drinking seltzer water but it's not really helping. I know Tums is safe but I haven't been to the store yet.

I think if you tried some TUMS it would be OK. As for indigestion and heartburn, they are just about the same thing. Too much acid builds up in your stomach...frequent complaint from "mommies to be".
The gas that has built up there was because you went to bed too soon after consuming food...not a good thing to do to avoid gas build up. Call your OB or pharmacist and ask them if it would be OK with them if you took some Alkaseltzer...to bring up the gas. Undigested food that sits in your stomach late at night, just automatically builds up gas. Good luck

try pepto and see what happens

If you feel a type of burning sensation in your throat, then it's probably acid reflex. Call your doctor, describe your symptoms, and see what he could recommend for you to take. Congratulations on your baby. Hope all goes well.