Mine was bc my body was refusing to stretch which is probably y my son was two months early but everything is all good :) now he is a healthy 1 year old & we r trying for our second but hopefully u don't have ur baby early :)
Did they say why it was happening?
I had that too mine was so bad I couldn't walk went to the hospital & they said get a pregnancy pillow and a maturity support belt to help &trust it helped more than u'd think
I called my ob office and they weren't concerned. She asked questions related to my kidneys but I have no symptoms for that other than the back pain. And I guess I should have used uncomfortable rather than unbearable...but I do have to lay down often to get relief.
Any time that pain is "unbearable" during pregnancy it warrants a call to the doctor or a visit to an urgent care....it could be nothing, but the word "unbearable" is usually a good reason to get it checked out.