I have 26 eggs in the bator and I candled maybe 10 on Day 8. One was clear and obviously infertile. All the others looked the same. They had a dark mass on one side--however, I read that the chick should be forming in the large end of the egg. When I candled, I held the egg up and down rather than on its side and the mass was filling about one third of the egg (up and down). Any input on this?