Just checked the eggs in my duck's nest, that are due to hatch on Monday. One of the eggs has a big Crack across the air cell. The Crack is not all the way through to were the shell is cracked open so I guess you would call it like a hair line crack. The duck is still alive and moving in the egg. Should I leave the egg in the nest or move it to my incubator so I can monitor it? I have a hen that keeps sneaking in my duck's nest to lay eggs and I'm wondering if that is how it got cracked. If it gets hit or something it will probably crack all the way. What should I do?