It turns out I pulled a muscle or bruised a rib...seems like I pulled something though I don't recall doing it. Doc gave me a boxing-wrap like...giant ace bandage like thing to compress the chest.

Basically I have one tender area at the rib, and if I stress those muscles, or hyper-expand the rib cage (cough) it can hurt. He did x-rays, no obvious issues, so said take like 5mg prednisone for a few days, ibuproferin if I want, wear the brace if I want - and I can still lift, it's just pain but nothing serious.