hello everyone I have a pekin pait and the hen is giving me an egg a day and still hasnt stop. All have been fertile my incubator is full with them and i candled to find that all of them are growing beautifully so fertility is great! my question is how can i tell if an egg is fertile or not before i put it in the incubator? I know you can candle them to see but i dont see anything, is there something i can tell by from candling them that early? and i am wanting to ship some eggs for people that are interested in my fertile pekin duck eggs, i wanted to know though, if i wanted the people to receive eggs that are alive and fertile until what day can i ship the eggs how old can they be? Also what is something to watch out for or any tips on hatching fertile eggs that belong to someone else and are being shipped? Thank you very much!