Broken tailbone after birth?

My baby is 15 months old now. Ever since I had him, I have had a stabbing pain in my tailbone area when I get up from a seated position. Also my already bad lower back pain has increased. I thought it was all part of normal post baby life and tried to ignore it. I recently shared with my mom about it and she said it is NOT normal and that it could be a broken, bruised or dislocated tailbone. I’m going to call my dr. Anyone else experienced this situation?