Nausea a sign of labor?

Summer
I read that nausea/vomiting and diarrhea are signs of labor because your body is slowing down digestion and getting ready for baby. I've been throwing up for 7 hours now. Getting some strong contractions, they were 5 minutes apart but slowed down. I feel a lot of pressure and it feels like I might poop myself but I can't go, I've tried. I just don't want to go to the hospital with false labor yet again. Monday my doctor said my cervix is barely starting to soften and I'm only 1cm dilated. I'm 37 weeks. Would you call the doctor or just try to sleep and see if you feel better in the morning?