I finished work at 36wks expecting to relax for at last 2-4 wks before bub was born. I had a feeling on the Sunday that I better go and get my Christas shopping done NOW so spent the whole day at the shopping centre. Monday morning at my OB appointment I was induced within 2 hrs for pre-eclampsia and bub was born 5 hrs later!

With DD I was told to expect her around 34wks due to a heart condition and BP and told they wold probably induce. 34wks came and went the condition had stabilised so we were told we could go full term. We got my mum up early as I was SURE she was going to be born around 36-38wks I had so much pre labour! 4 days post dates I was induced :-)

So I guess, I do think you can 'know' but it isn't always reliable and after our saga with DD it is much better to keep telling yourself you will go overdue than to anticipate an early arrival and feel like you are 6 wks overdue by the time you are full term :-)