Pelvic pain and pressure

39 weeks today and I've had pelvic pain before usually all the time but tonight it is so intense I'm about to be in tears, I can't even walk to my kitchen without stopping and nearly sobbing, the pressure in my bum and pelvis is so intense. I feel like I constantly need to go to the toilet but nothing happens, please tell me this means something, I feel like breaking down I'm in so much pain, I wish labour would begin but maybe this is just normal now?