What Causes Pain In Ribs And Stomach On Breathing After An Injury?

Hi, I fell backwards and basically fell into the front of a couch, my friend then fell on top of me onto my chest/abdomen. I lost my breath and couldn t speak for a few minutes. I think it might have winded me. My chest and abdomen were sore for about twenty minutes after. I expected to wake up sore the next day but was surprisingly fine. This was three days ago. Last night as I was stretching to reach something, I felt a twinge. Today, if I m stretching or bending or twisting or if I take a deep breathe my ribs and stomach hurt. It s not extremely painful but does seem to be getting worse as the days gone on. I m not in agony but am uncomfortable.Above my right hip is also tender and my back, slightly above my hip, aches. My question is could I have internal bleeding and not have realised until now? Or is it more likely to be just badly bruised? Thanks