Uncomfortable

I have been trying to avoid falling into the rate my symptoms group lol I just have to ask though. . I'm 37 weeks today -noticed I have dropped -and I woke up with lower back pain.. Almost a burning.. Off and on all day..  Now almost like period cramping for the past hour...baby is really active and has been all day -even now!  My birthing ball isn't really helping right now. I'm hydrated.. Uncomplicated pregnancy thus far. . I do want baby to come when he is ready and no sooner so I'm nervous.. Any comments are welcome