Back contractions??

Chelsea

Any Momma's have there experience back contractions without any tummy tightening? FTM here and I'm due in 2 days. My lower back has been having off and on pain, radiating into my bum since early this morning. I've had 2 pretty intense episodes in the last 30 minutes that do not stop when I move, switch positions or take a drink. As of today at the doc, I am 60% effaced and 1 cm dilated. Any advice or input would be appreciated!!