Hi Donna, it's not really a case of how long they will let you go over as they can't force you to do anything. You can take the decision to just wait and see what happens and be monitored in the interim. I have friends who went over by 3 weeks. However, they tend to recommend that you get induced after 14 days and that is the view that we took last time as the risk of still birth was four times higher after 42 weeks than it was between 37 and 42 weeks. As such, the latest I would allow myself to go over would be 17th Jan (2 weeks after my IVF calculated due date which I consider to be the most accurate or 16 days over my 12 week scan due date). I think I'd rather have a caesarian than be induced again though.