Back pain, not cramps! And YES, get the girl some Advil.
Also to the gynecologist. I always had back pain, and didnt even figure it out until a few years later when a friend on my sports team said, "Your back always hurts right before you get your period!" I was clueless! Anyway, turns out my uterus is tilted (a common thing), which can cause the back pain. Gyn can do an exam, talk with DD, and make some suggestions. There is a birth cotroll, SSeasoniqe, which is 12 weeks, so you get your period 4Xs a year instead of 12. I couldn't live without it. The 4Xs a year I do get my period, I LIVE on Advil, actually taking 4 every 5-6 hours.
And, had back labor for 1 of my 3 labors. Talk about excruciating, I thought I was going to die! 2nd was regular labor, and I didnt believe it was real (so mild I thought it must have been Braxton Hicks) and we barely made it to the hospital. For #3, regular labor again