pre term labor?

Ashley
I'm 34 weeks pregnant I have a constant headache everyday lots of pain in my stomach and back and had diarrhea as extreme nausea last night. Went to labor and delivery yesterday and was having contractions but not Constant enough and dialated 1/2 a cm. I have called my doctor cuz I am still in pain and am waiting for him to call. Any ideas what could be going on?