How exciting - I just candled today (day 10) and took out 6 eggs - cracked them and one had started, one was not fertilized, one was scrambled and 3 were just yolks.
I started with 41 eggs and am down to 36 - I could clearly see a couple of the embryos dancing and could see some veining in most of them. Some I was just not confident about so I left them to develop a few more days.