What's the earliest you can candle an egg to see if it's fertile? I am pretty sute that you can see at 3 days, but can you see any sooner? From what I read in the wonderful book co-written by the co-founder of BYC, you can see the chick developing at 3-days, so I'm hoping that at about 24 hours after an egg is laid, you can candle and see something.