With my first pregnancy the sore back kicked in very early and progressively got worse! i would lay on the bed (after trying to make it) crying because it hurt so much and i couldnt get up!!!!
With the second preg i had no back probs but i had pelvic displacia (SP??) so that area was just as painful and super hard to walk and i had the belt things and crutches!!
This time the pain is in my bum!

at the top of my legs!!!
You just cant win!!!!!

i did find a pattern with me - where the pain was during pregnancy was generally where the pain was during labour! so labour pain in my back was by far the worst!!!!!