I have a broody Cream Legbar who has been sitting for a while. She started with 4 eggs, but since she was in a nest box for a while, she has now 7. It's my first time, for her too. At first I thought she was still laying, then I saw it was other hens laying in the box while she was sitting. Given the uncertain starting time of incubation, I have tried to candle the eggs, but no luck, the shell is too thick and hard. One sounds like there is something hard in it floating in fluid ?! Nothing with the others. Any tips for candling such eggs? Also I'm worried I may have harmed the possible chick in the "floating/bumpy" egg when I shook it. It has been 3 weeks since she started with her 4 original eggs. How long can I let her sit before calling it quit? Thanks . Worried first timer.