The thing that differentiates bleeding due to implantation and bleeding due to periods is theimplantation bleeding color as explained above. Implantation Bleeding vs. Period. There is little difference between menstruation and implantation bleeding to begin with and the first couple of days can be very confusing.
Ducks can spend a week laying eggs.. the timer for hatching does not begin until they actually begin to sit or brood.. Fertile eggs can be laid and sit and be fine with no mom on them. as long as they dont freeze.
Ducks don't normally sit on their nest of eggs till they have a full clutch(which is approx. 12-15 eggs). One of my girls started laying not to long ago and after there was about 7 or 8 eggs i gathered them.