My broody hen is sitting on 3 fertile eggs. I have candled it on day 10. Two were developing very well, but I was not sure about the third one, so left it under her. Today is day17 and I have candled it again. The same two are still on track, but number 3 looks like the development of an egg on day 11/12. I am sure I have seen movement - 3 times! Could this be possible? I have left it under her and would not candle it again untill the first two have hatched.