Our Amrock has been laying for about 3 weeks now on a daily basis. They have all been normal size eggs until today. This egg is smaller than a ping pong ball but larger than a shooter marble, you know the bigger of the two marble sizes. Almost half the size of her normal eggs. Is this expected out of a new layer? Her feed has not been changed and the other hens in the flock are laying their normal size. Should I be worried?