Upper back and chest pain

Bri • Married and mother to babygirl💓

I’m 28 weeks and I’ve been having some upper chest and back pain , right by my spin . I’m not sure if it’s trapped gas, increase of weight or something serious . If it was lower back pain I’d understand that more but it’s upper back and upper chest pain. I went to the doctors and they did a chest scan and everything was fine , any idea of what it could be ?