I got some cayuga duck eggs from a fellow BYCer. I hand turn them, so I candle them every so often to see what's going on. A few of the eggs look like the yolk is moving around in there when I turn it? They don't look scrambled, just like they aren't stuck in one spot like the others. Is there any chance these will hatch? Plus I have 2 pekin eggs from another BYCer. These two eggs have moving air sacs. They have been set for 4 days, and when I turn and candle them, the air bubble follows the turn all the way around. These are no good right? Or can they hatch that way?