Rib Pain under breasts, feels like bruising

Daina
I am 24 weeks and have had a terrible pain under my right breast on my ribs. It's been going on for several weeks. I bought larger bras as well as non wire bras. This doesn't seem to help. I have also gone 3 days without a bra completely Hoping it's just a constriction thing but the pain is still there. I have to ice it to get some kind of relief. I feel like there should be bruising visible. What could this pain be from? I have a short torso and am carrying high, could this be rib pain from my uterus pushing against them? I have a sedentary job so maybe posture is to blame? Any insight and remedies would be great!! TIA