I have a question for those of you that have hatched ducks. I'm new to ducklings but always candle my eggs before putting them in the incubators to check for any cracks, detached air cells, etc. When candling the Mallard eggs I noticed that I could see a tiny pink spot and sometimes a tiny ring inside every egg, not a meat spot but almost looked like a super early embryo started. Is that normal or did all of these eggs start to develop for a day or two before I got them?