Hi! Over the summer I got two female Rouen ducks and I ended up taking care of a friends male pekin duck. I thought I would have more time to prepare for this because when I researched them they were spring layers and it's the middle of winter! Anyhoo.. They laid their first eggs yesterday (yay!) but I don't know if they're fertile or not. I do have them in an incubator and I've read about candling. Does anyone have some helpful advice? Thanks!