I bought low acid orange juice and it taste funny :(
Yes it's probably the acid from the orange juice. It happened to me to. I also really like orange juice. I found minute made orange juice with low acid and that did the trick. So you should try that.
Oh yea the heartburn later in pregnancy is the worst!
Its the acid... i love it too but it gives me heart burn now :( try watering it down
It's probably the acid from the juice upsetting your stomach
Maybe the acidity in the orange juice is what's doing it. That can be hard on your stomach.