I have four hens. They must be hens! No crowing, smallish combs and waddles, no pointed hackle feathers, and I get 3-4 eggs a day (from BO hens). There are no other chickens anywhere within miles of here. So I break open a couple eggs that were a bit over a week old today and each had a spot on the yolk with a white dot in the middle. Not exactly the 'bullseye' you see in the instructional pictures, a solid white spot in the center of a larger spot. There is just NO WAY they could be fertile! What is happening here? Do I have a swishy roo?