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.
Well I'm not sure if it's the same all the way across the board but according to Storey's Guide to raising Ducks ducks will start laying eggs at about 14-17 weeks of age. I've got it marked on my calendar to have some nesting boxes built with a few fake eggs ready to entice my girls.