Nausea/vomiting at 36+ weeks

Ra
I am 36+5. I was literally awake all night last night with stomach pain and vomiting. I haven't eaten anything unusual and I haven't been around anyone who is sick. 
Says online that some women experience this in very early labor. Has anyone done this? I didn't with my last two pregnancies but who knows. All I know is I'm exhausted right now lol