Help what is this ??

I've been having horrible tailbone pain and I thought it was the way baby sitting . I felt around 2 days ago and noticed a bump. Today I ended up in l&d; for contractions and doc said he couldn't see or feel it but knew I was in pain because when he touched the area I winced. Now I'm home and it's hurting constantly and I felt it and it's a little larger. I'm scheduled for induction in 2 days and I'm freaking out. I can't even walk without feeling it