Contractions? 36 weeks

Very very bad back pain 
All over my back 
Goes around to front
It hurts to walk a little 
Crampy, achy, 
Comes ever 4-5 or 3-4 minutes 
And has been going for almost an hour
Change in positions doesn't make it feel any better... 
cramp and aches in upper leg like right where my butt is 
But it doesn't seem to be getting stronger 
I'm not sure.. 😕 anyone?