What Causes Tailbone Pain?

Had some pain in my tailbone- only felt it when I sat with all my weight on it or put direct pressure on it. Felt like it maybe could have just been a bruise but I hadn t fallen on it or anything. Next day I tried to do some squats at the gym & I think pinched it bad? Now It hurt to sit, run, twist, bend over. The pain is very specifically at the tip of my tailbone. My back is fine, my butt is fine. Just the tailbone. Is this a pinched nerve & what are the recovery steps?