I have Khaki Campbell ducks and I have gathered some eggs from them to incubate. My friend also gave me some of her Pekin duck eggs to incubate as well. I have had the eggs in the incubator for a while now, it has been about 6 or 7 days and I don't see any veins, only a dark yellow cloudy spot. I have seen some growth in the air sac of the egg but that is all. I candle them about every 3 days to see if they are growing or not. I have a boy duck so most of them should be fertile. Please help! My duck eggs have looked like this for about 2 or 3 days now.