i bought three cayuga eggs a week ago that were already in incubation as the guy was 20 mins away. they are set to hatch this sunday or monday. its now friday and i can see the air sac however no internal pip does this mean there not going to hatch or could they just be late. also one of the eggs the air sack is massive and is going up one side of the egg could this be a bad one? its also a bit lighter then the others cheers.