My midwife says the baby is breach and . . .?

I have been feeling this pain under my right rib when I sit slouched ( I really need to work on my posture). If I really arch my back the pain or pressure goes away....is this the baby (already up so high?) I think I felt him kick right between my ribs the other night while I was lying in bed. I have a really short torso, maybe that is why I am feeling the baby in my ribs so soon, but only on my right side? Anyone else feeling this at 25 weeks? (first pregnancy)