My daughter has 3 silkie hens.one went broody. Went and got 11 fertilized eggs from original chicken farm she came from. Placed them under her on the 5th. She has been sitting on then everyday but 15 min to eat and drink. Today my daughter noticed a smell from 2 eggs. I candeled the eggs, the 2 smelly ones can not be seen through and one has small crack, they are also heavier than the others. The original mothers were free range and no time frame on when the eggs were laid or how long they could of been sat on before she gave them to me. So do I leave all eggs like they are in the nest and see what happens? We are new to this. So we are hoping for good results.