This is my first pregnancy, and I've read that by 15 weeks I have to inform my employer of my desired start date for maternity leave. For those of you who have been pregnant before or have set the date for the start of their mat leave this time, how long before your due date did you set it? Of course I'd like to save as much time as possible to spend with the baby, but I'm also completely naiive to the realities of trying to work at 9 months pregnant!