I had SPD throughout my pregnancies and went nearly 2 weeks over for my VBA2C and VBA2C2.

I found having a good cry helped bring on the contractions, I had prelabour for a few weeks last time round, and I went into labour after having a good cry the day before, and a massive walk up and down a hill. Babies come when they are ready, but it also helps to clear any fears or apprehension you may be holding on to. I wrote a "Fear List" of everything I could think of, and i helped that cleanse whatever was holding my labour back.

Good luck! It can happen. Oh, and she didn't drop until I was well into full blown labour, I just did squats with each contraction to help bring her down.