Possibly close to labor?

Christina
Im 39 weeks pregnant today, and all day since about 4 this morning when i got up to go to the bathroom it has felt like a 20 pound brick is sitting on my pelvic bone and ive beenhaving discharge all day.
At my last appointment on monday i was 2 cm dilated and 50 percent thinned out
Has anyone else had this shortly before they had the baby?