5th February 2008 21:46
Even with a 'normal' 28 day cyle, ovulation can be anywhere from cd12 - cd18 or so so it's hard to tell, but it's only a week in the difference. If your conception date was actually a BD date, then it could have been up to 5 days later that conception actually took place, so it's still a week either way.
If it comes to a stage where induction is brought up, I think the hospital will go by their scan dates anyway unless you're sure of dates yourself....but as for others, just lie and tell them you're due March 15th or something like that