signs of labor?

I'm 39 weeks today. 
I woke up at 1am with horrible heartbearn, nausea, & cramping.
Was able to go back to sleep but kept waking up to pain covering almost all over my stomach. 
I feel like my stomach is being stabbed it's not the usually pain I feel for Braxton hicks.
My back is achy. 
I keep going pee & feel like I need to poop but nothing come out. 
Possible labor coming? Or early labor?
Ugh I have no idea but I definitely don't feel well😣