We have 10 hens, 21 weeks old. (Aracana's, Buff Orpingtons, Light Brahmas) and we got three green eggs two weeks ago. Nothing since then. I am hearing the "egg song" but am not finding any eggs. Is this normal? They all appear healthy and are shut in the coop at night and are in their large pen during the day until we let them out in the late afternoon when we know we are going to be home for the rest of the day. I have only heard the song when they are penned up and have looked for eggs, but don't see anything. Thanks for any thoughts on this!