horrible night

rachael
Went to my dr yesterday, got another membrane sweep... Come 5pm last night until now (7am) my back has been killing me! 
I did lose some of my mucous plug last night... But omg this back pain is horrible... Slept in 2hrs chunks all night... Then up for an hr to stretch out my back... 
It's not lower back its up high... Where my bra would sit... 
Any ideas what would cause this type of pain?