Sunday we had an early hatcher...a day early. He broke through the egg within a couple of hours. He's healthy and strong and we're so excited, as this is the first time we've hatched eggs. There is still 4 eggs in the incubator that should have hatched yesterday. I can see a small light circle at the top of the egg on 3 of them. Is this because they've pipped? I dont hear or feel anything when I pick them up like I did with the early hatcher. I noticed this circle yesteray. Should we be worried?