I have SPD but I've also been pregnant 9 times in 12 years with only 1 year off from any pregnancy, although I WAS nursing into that time.
I went into labor 4 days early with my first separation (5th) but held off labor SOMEHOW because my husband was stuck in a canadian airport trying to get back. Dont ask me how I did it- I dont even know how- but I managed to progress all night long and meditate even until 10 cent with only 1 cx every 30 min to an hour. As SOON as it was known he would NOT be getting back in time the next morning, I went into full blown labor and she came out just after. She was my biggest also- 8,1
My second with a SPD was Emmalia, my 6th, 20 mos ago. Labor was easy-peasy and then all of a sudden my water broke and 5 minutes later it was showtime. Unfortunately, I had a week of trouble to show for it from shooting out a bullet baby- vaginal skid marks . >.<
This time I have SPD pretty badly. My kiddo has a freaking 4 bedroom house in there! His head is so engaged that he zings my thigh nerves and I get major stabbing cervical pains to the point where I cant even have a conversation without gasping every few seconds. My poor midwife feels helpless for me, hahaha! I have no clue what this birth will be like but I have to say with as engaged as he has been- Im expecting it was be sudden and fast.