Next appt is this Thursday when I get an ultrasound where they'll estimate how big my son will be…

Next appt is this Thursday when I get an ultrasound where they'll estimate how big my son will be weight wise. I'm 34 weeks today and let me ask if it's typical to have middle to lower back pain which feels like it extends all the way around my entire midsection to include my stomach/baby bump. That, a small bladder, and heartburn woke me out of a sound sleep. I am lying here wondering how on Earth I'm supposed to handle this 6 more weeks??? Of course humbled that I've made it this far but it doesn't take away from the fact I am super uncomfortable and wondering if my son is a linebacker secretly.