I got a new hen a couple of months ago. She laid 1 egg the day after I got her then didn't lay again for a month. Since she laid the second time she has been laying consistently. However some of her eggs have this weird black stuff in them when we crack them. What is it? Is the egg still ok to eat? She is not around any rooster or other hens. She eats layer feed and I let her out to free range every few days. She is about a yr old according to the lady I bought her from.