Early labor?

Kirstie
I'm 36 weeks 3 days. I had Braxton hicks a few nights ago, and today I have lower stomach pain, lower back pain                (feels like cramps), nausea, diarrhea and a headache. Should I be concerned? 
Side note I'm pretty sure I have already started to dialate, I can get the tip of my finger into my cervix. I go to see my doc in Friday morning.