39 Weeks tomorrow

So i had sex this morning with my bf and honestly i was feeling great no pains no nothing. Now for like an hour I’ve been having contractions wasn’t really paying attention just thinking it could be BH, but just now i had one that I literally had to drop my phone and breathe cause it wasn’t painful but i felt I couldn’t breathe and i felt like stabbing in my belly, pelvis and thighs. Could it just be because of the sex this morning? Last time i got checked i wad 3cm and im trying not to be at the hospital for a long time I wanna go as far as I can from my house before i go in😣