I have 4 brown eggs 2 of which are very inside dark and I can see the airspace at the fat end. The other 2 don't seem to have the air pocket. Should I remove those two because they aren't developing? It's hard for me to really see much in the eggs. Is there anything else that will tell me if the 2 dark eggs are ok and still developing? We had a 5th egg but she kicked it out. By the time I found it it had a crack in it...all those big chicken feet.