While At Work, I Reached Down Into A Deep Garbage

While at work, I reached down into a deep garbage can. I felt something like a pop and then pain just under my left breast. Felt like a rib or possibly pulled muscle. Bothered me a bit for the remainder of my shift but nothing too major. The next day it seemed fine. Fast forward nine days and suddenly it's uncomfortable and moldy painful and I can feel a hard long bump extending along the area that leaned along the top of the garbage can. Is it normal to feel this after more than a week of nothing?