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.
I personally think 10 eggs is enough for any duck to sit on, and you should mark the eggs when they are layed with a number. This way, you'll only keep the freshest 10 eggs in the nest at all times. The male takes no part in the incubation of the eggs, and the eggs will hatch in 28-35 days depending on the species.