Oh yes! Since around week 20, I have severe pain in my tailbone after I've been sitting for 10 minutes or longer. But if I get up slowly and walk around the pain goes away. I think it's cause I am carrying so low and I'm short, so all the weight goes to that area when I sit. Other than that, there is of course the lovely hemroids that I have graciously received as well!
My doctor recommended one of the donuts to sit on to relieve the pressure on my tailbone. Hope you are feeling better.