I have 3 ameraucana eggs in my incubator that were scheduled to hatch yesterday but havent yet. This is my first time trying to hatch eggs so im learning.The eggs are blue and I can see light pass through them very well during the first week of development but after that i cant see much. For the 3 that were supposed to hatch yesterday, absolutley no light passes throught them at all so I cant see what is inside the egg. As a result I have no clue if there is a developing chick inside. At what point can I assume the egg is not going to hatch?