I have not had any roosters around my hens since about September, but my only current layer, Martha the Barred Rock, continues to lay eggs that appear fertile (have a little red dot on the yolk that appears to be an early embryo). What is going on? I need to get a pic of what they look like, I know, but how is this happening? There is absolutely NO CHANCE of her getting anywhere near a male. Anybody know what's up?