I'm 23wks today and have been having bad pain for half hr. Upper ab/back feels like contractions and gas but only pain and tghtening in upper. Labor?

Preterm Labor. Your symptoms could be from early contractions. Go straight to your labor & delivery unit for evaluation and to make sure you're not at risk for preterm delivery. Some places argue that 23 weeks is "pre-viable" but better safe than sorry. You need to be monitored and have your cervix checked, possibly an ultrasound to measure cervical length. Don't delay please.