I bruised my bum and now it really hurts?

so i was bouncing on an excerise ball and then the ball rolled away when i was in the air. i landed on my bum. from 3 feet in the air. it hurts in the lower back area. but my right bumcheeck and tailbone are achy to move when i stand up, bend down, or sit down or even walk. do you think i fractured it or roke it? the ground wasnt very hard, it was one of those plastic floors with squishy stuff under. right now im putting ice one it. and im going swimmin tmrw, so should i go if it still hurts? thanks guys! u rockk!!