Extreme Heartburn and Blood in Vomit

Liz
I'm 35 weeks pregnant and I've been having extreme heartburn since yesterday. I've been feeling full to the top and I barely can eat, woke up with no appetite at all. I'm burping up a sour fluid and yesterday when I spit it into the toilet there was blood in it. Anyone ever have this happen to them? What should I do? Should I be concerned?