I broke my tailbone about 9 years ago (when I was 9

) in a bicycle accident. I at first figured it was seriously bruised so I ignored it, but after 3 months of pain I finally got my ma to take me to the doc. They did an xray and it had been broken but was healing already and they couldn't do much for it anyhow. If you did break it, I'll tell you, it will hurt for a hell of a long time, and then after a while it will only hurt sometimes. Like if I sit in one spot for too long, it hurts like crazy to stand up. If I sit on a hard chair, I feel very uncomfortable.
Try not to sit directly on it for a while, use a cold compress, and avoid straining work that irritates it. If the pain is unbearable, go to the docs and get it checked. Good luck!