What's going on..? TMI no pic

FTM, first pregnancy. So I'm due this month and I'm an extremely irregular person. I usually only have a bowel movement every 3-5 sometimes up to 7 days, it's how I've always been. I also have very hard stools and often need to use stool softeners to go. The past three days I've had extremely soft (not diarrhea) bowel movements. 
A few days ago I also lost my mucus plug with no bloody show. 
I also dropped a few days ago. Ever since I dropped I've felt extremely out of it, just not like myself. 
I constantly have back pain but no contractions or stomach tightening at all.
My baby's movements decreased within the last week to week in a half. What could be going on?