Signs?

I've been dilated 2cm and 50% effaced station 3 for three weeks now. I've been having Braxton hicks since thanksgiving, they are stronger now than they were but they are not consistent. I've been having boer movements more frequently for the past week. And started losing bits and pieces of my mucus plug Sunday and Monday. The past two days I have been having heavy pressure in my pelvic area, and sharp cramps. Intense but not painful contractions, I can talk through them but they stop me in my tracks.  I have no idea why to think....? Help!