Twice I've broken bones and didn't realize it, after thinking back I realized I had a sick to my stomach feeling for a long time. One was a broken toe and the other was a hairline fracture of a rib. Both were found when I went to the doctor weeks later complaining that I had a bruise that wouldn't heal. In both cases the doctor said, "Yup you broke it, not much we can do now". I would say if it dosn't hurt when you walk on it, you don't feel sick to your stomach, and the bruising goes away in a reasonable time, then your fine, of course ymmv.