I can't really answer your question as this one's obviously not out yet, but to say that I've had three VERY different pregnancies in terms of end-stage:
DD - no prelabour, PROM and spontaneous, but gradually building labour from about 12 hrs later
DS - prelabour over night and for a few hours in the morning... a few hours of silence followed by a ROM and a very forceful and unmistakable onset of labour
BUMPY - two hours of prelabour each night, most nights for almost a week... just enough to really F with my sleep... then nothing. No show. Lots of BH in the evenings but no sign that baby is imminent. So who knows?!

Feeling for you Love. The unknown factor is the hardest. Sending you lovely, happy spontaneous labour vibes. xox

Maybe watch some birth vids? I just watched Bella29's again (on Documenting Delight blog if you search Belinda Birth). Made me happy and hopeful... and cry a bit too!