Deni - You can start Mat leave earlier if you provide a certificate from your OB stating you are unfit to continue working beyond a certain date, without having to amend your EDD.

BTW EDD's are just a guide, my DD was given two different dates during the pregnancy and she came well after both of them, I went into spontaneous labour the night before I was booked in for an induction (at 41 weeks), and it was still another full day before she was born!. Dont worry to much about it, and if anyone askes say your due late October without giving an actual date.

BOL

Lisa