Hi Abby's mum, I'm the person Sherie mentioned, I had SPD during my second pregnancy, which was a huge shock since my DH was away for 4 mths and I was quite debilitated by it. To the best of my knowledge there is no association between SPD and early labour, although I understand some drs might consider it grounds for an induction if you're in a lot of pain and ask for one.

With regards the actual effect on your labour I understand you may need some extra positioning assistance depending on your symptoms, however I had a c/section this time so if anything DD's birth was the first time in months of being completely pain-free! LOL

There is a fantastic site here Pelvic Instability Association . Try not to get too scared when you read it as SPD can get quite bad but not necessarily. In fact if you see a physio early on and start doing the right things you can minimise your symptoms and carry on functioning to a degree.