I'm 40+6weeks with my second.

This morning at 5am I and husband had sexual intercourse. (It was great, climaxed at the same time) anyways I know there is after sex Braxton Hicks, but those only last a few hours... so starting around 10a I had tightening in stomach, accompanied by lower back pain and pressure in the bum, lasted 20-30 sec each spaced 7-8 mins apart lasted until 3p so for 4 hours. Was it just sex contractions or da real deal early labor?