37 Weeks - What am I feeling??

OMG... I'm 37 weeks and already 2cm dilated. My stomach feels "traumatized" today. I'm pretty sure it's gas . I began the day constipated and had TWO Fiber One bars today to try to move things along. Overkill?

But I can barely move with the pain... and pangs! My stomach has been hard as a ROCK on and off (mostly on) all afternoon/evening. My lower back hurts, but I think it's just because I've been sitting most of the day. And... I was so constipated today , I actually think my lower half just hurts from "forcing"... I actually felt like I had sciatica pain while I was trying to go. PAINFUL!

Needless to say, this hasn't been the most comfortable evening for me.

But... do you think I can just chalk it up to constipation/gas? Or do you think it's contraction related?