Ok, I just came home from running errands and heard chirps in my basement. I looked into the incubator and there is a chick! I set my eggs two weeks ago tonight. I am guessing the woman who sold me the eggs let some start. That explains why I could not candle two of them. They were solid black inside, but being Maran eggs, I assumed they were too dark shelled. The others looked at the right stage of development when I candled them on day 10. I didn't even have my brooder set up because I thought I had a few more days before I would set it up "early".