Thanks for your replies girls. I have been told that all of these dates are "accurate" as they're all 'early' in the preg (i.e. first half) but I have also read that the really early scans are the most accurate.

I think I will try to get an u/s tomorrow and then, if all looks ok I will push the induction back a few days. The doc wanted an u/s done on Friday but it was nearly 3pm and he couldn't get me in so then somehow we were talking induction on Monday. After I left I felt a little rushed. I also want to know if he thinks there is some medical reason for needing to deliver this baby sooner.