I have a hen who has been nesting for what seems like an eternity. She has been on at least a month or very close to, and nothing has happened. Do I let her eggs spoil on her so she makes the decision to try again some other day, or do I assume maybe there are some fertile ones in there and I just didn't calculate days right? This is her first nest, and she is a black star with brown eggs. At least 4 of the eggs are blue, and I don't recall those hens being with the roo. I don't want her to feel threatened and never nest again.