The eggs were shipped. Received on Thursday, placed in incubator on Friday. So I decided to candle a couple eggs way before a week's time. This is their second day. As I rotated the eggs in my hand, a dark fuzz/ circle also moved around. Is this what they call a detached embryo? Is this a reason for concern that you can predict early enough or is it way too early to tell if these eggs are infertile?