I know you said more than two but both my labours started completely differently.

Moo - no prelabour, no signs of impending labour except for a bloody show earlier in the day. Had my first contraction at 7pm, regular contractions continued on at 15 minutes apart and progressively got closer etc. Water did not break until labour was well established over 15 hours later. He was 3 days 'overdue'. Labour was 22 hours.

Buster - prelabour went on for weeks! Drove me crazy! My waters broke one morning with no contractions following for several hours. Was in hospital having monitoring when contractions started up again, irregularly, until it all fizzled out again! Stayed in hospital just to be sure and overnight the same prelabour irregular stuff started up yet again...but this time it all resulted in birth lol. He was 10 days early and his labour was only a couple of hours.