Feeling like I'm about to start my period

I'm 31weeks 5 days and since last night I've been miserable. I kept waking up sweaty and I slept naked with two fans on and not under a sheet or anything, I've felt crampy, puffy, irritable, have had so many sporadic Braxton Hicks contractions that have been taking my breath away, sharp pains in my cervix like someone is stabbing or pinching it, (tmi) I've had super loose BMs all day, and I can't seem to drink enough water. Baby is moving still so maybe I'm dehydrated. Would it be a good idea to call my dr, head to ER, or just see if this all fades away?