Contractions!

Sam

39 weeks tomorrow! I’m having contractions that are every 3-6 mins apart- one was 12 mins apart- for the last hour. Lasting from 10-40 seconds! I did have sex beforehand, would that be the reason or is labor really starting?! I know no one can say for sure but just curious if anyone else had this happen!! Going to continue to monitor them though!☺️ I also feel like my butt is going to fall out LOL.