36 weeks anyone else going through this?

I've been having contractions/braxton hicks every 15 - 20mins for the past week this morning I woke up with pain in my pubic bone and lower back, I thought it was cause I'm having pressure in my rectum but I've tried to have a bowel movement and cant, i tried drinking water to see if it helped but it didnt. Should I be worried or is this normal towards the end of my pregnancy I'm 36 weeks I know it sounds a little gross but is anyone going through this?