I have a theory, but I dont know how correct it is until I ask what your experience was.

With DD1 most of my BH were during the day. I started early labour around lunch time, and was established at about 5pm, around the times that I would have been having BH normally for that pg.

With DD2 most of my BH were at night. My labour was established at about 11pm.

This time most of BH are in the evening again, so considering the pattern I have noticed, is it more likely that I will be in labour at night?

So what I want to know is what time of the day were your BH mostly, and what time of the day did you go into established labour.