I did the nipple stimulation the night before my waters broke. I woke up to the "pop" feeling and had to bolt to the bathroom at 5am.
Prior to that I had no indication at all that I was close to labour and I was only 36+3. (I didn't actually think it would work!!) Contractions hadn't started by 9am so I had some induction acupuncture and was having contractions by midday.

No idea if it was all coincidence but I'll go the natural route if there is ever a next time for sure!