Egg in the Weeds

[Madie'sOddFlock]

Our house chicken(who spends the day outside, but sleeps inside), Peggy, was sitting on 3 eggs today. My rooster seems to finally be able to mount the hens(he's a bantam... or just really small). I candled them all. One was completely clear. The second one I could see an air sac at the point and a dark blob on the bottom. The third one is the same as the second, plus a really dark, smaller, blob that was moving in the middle. At first, I thought it moved as I turned it, but then I held it still and it jerked to the side. 1.) what could it be?
2.) do you think any of the others could be fertile? just for future reference.

 

[Sphynxmama]

Air sack should be at the rounder end. Jerking blob is a chick growing, you should also be able to see veins. Sounds about 4-5 days old x

 

[Sphynxmama]

Leave the other two for about 4 more days then candle again - you don’t know when she laid them, they may just not have grown as much yet. If still completely clear then discard.