We got our first egg 8 days ago from one of our 18 week old white rock hens. She laid three eggs in about 4 days and it has been 5 days since then, and no more eggs! What can this mean? Is it normal? Could there be some problem? We are so new at this! This is our first flock. Wondering alos why the other hens/pullets aren't laying yet... Any advice would be sooo helpful!Thanks!