So I've got an egg in the incubator basically long story short my female runner died a week later I found an egg of hers and thought I would try incubate it, it's been in for 7 days and the air sac is definatly growing but I can't see any blood vessels, I think I can see a faint dark spot in the yolk but it might be wishful thinking. Would you guys give it a little longer? Thanks