35 weeks and extremely nauseous?

Brionna
I'm 35.4 and currently up all night with nausea. It happened once before and I'm wondering if anyone else has experienced this in the third trimester? I was fortunate thus far and didn't get sick in the first trimester so I'm not sure where this is coming from. Also don't know if it's a sign of early labor? I've been put on bed rest (because of all the contractions I've been having since 30 weeks) and someone mentioned nausea being a sign of labor?