Squirt, don't know whether you've had bub yet or not but thought I'd share my experience. I have had PSD/SPD with all of my pregnancies in varing degree, I really think it was worst with my 2nd pg and this pregnancy it hasn't been as bad. But it didn't really affect my labouring as I think with pain being relative that the pain transfered to my back. I have posterior babies, they don't engage, just bob around I also have anterior placentas. I have had 4 vaginal births and hope to have another one very shortly.