well the same thing happened to me about 2 years ago. my tailbone area would hurt for about a week. this happened about 3 times before i traced it to heavy deadlifts.
went to the doc, had x-rays. i had some degenertive arthritis in my lower tailbone (i’m 50). turns out many people get this as they get older but the DL tweaked it really inflamed that area.
I am 30 and have that problem with Squats. When I went to get an X-ray, the doctor said that years of heavy lifting have had their toll on my lower back. He suggested to give up squatting all together, but I am back to doing it but lighter.
When I was about 18 I was squatting at the school gym one day and I felt, and heard, a pop in my tailbone. It didnt hurt until the set was over and for about a week after that I could not sit directly on my butt because my tailbone hurt so badly when I did. I had to kinda lean to one side or the other when I sat. I have no idea what that was as I did not go to a doctor. I never had a problem after that though.
Doc said there was no need for x-ray or MRI - as long as the situation didn’t take a turn for the worse. He said there was definitely no disk slippage.
Gave me some Celebrex and I’m feeling almost as good as new today.