I have 4 eggs in the incubator...I set them on Tuesday June 14th. So today would be Day 13. I have one in there that I took from a broody hen (took it from her on June 14th, but she had been sitting on it since June 10th) During candling it has always been ahead of the rest. Today all I can see is blackness and an air sack...i can't see any kind of veining, movement (this egg could be on Day 17) or has it died? questions questions!!!