I had DD2 five days ago (a wonderful homebirth) and I suspect that she might've been posterior. She'd been in the correct position throughout my pregnancy and my midwife didn't say she was facing the wrong way but from the start of my labour, I had back pain. The pain was sometimes constant, sometimes only appearing during a contraction and sometimes, even at the end of labour, all I could feel was the pain in my back and I couldn't feel my uterus (or rather the surrounding whatnot) hurting at all. So basically, if you had a "back labour" does that automatically mean bubs was posterior? She was also enormous, 54cm 4.4kgs and my midwife said I had the biggest placenta she'd seen, so perhaps the backpain was caused by the general lack of space in my uterus? XD