37 weeks pregnant, yesterday i was lightheaded, i puked up some foam that was like black/brown, and had a horrible headache , along with nausea which lasted a couple hours, and today i just got nauseated this afternoon and have been cramping on and off. Should i be worried? my dr. told me at 36 weeks i wouldnt make it to my due date she would give me two weeks. im 2cm dialated and 60% effaced.