hey guys, this is my first incubation. I have 12 eggs in the incubator that I put in there Tuesday night. I don't know how to tell if they are fertile, but I got them From somebody locally on Craigslist. From what I read I should be able to see a dark spot called a bullseye in the center of the yolk but when I can candle them I don't know what I'm looking for and I don't see anything but yoke. One of the eggs that is white I did think that I saw a dark spot in the middle but I wasn't real sure. I know that I shouldn't be candling them until at least day 5 but should someone as inexperienced as myself be able to tell for sure if it's even a little. Can you really tell if an egg is fertile or not or is it really just a guessing game. I guess I'm just worried that she just gave me an egg that she thinks is fertile.