Well I bought a new high powered LED flashlight today and now I can actually see into my brown eggs. They are at day 13 now and I was looking at this egg. There are two dark spots moving around in there. Could it be the head and the rear or a double yolker or something? The others don't look like this. I took a picture but it didnt take too well with my cell. I am trying to attach it now. I may try again with my camera later. Also see the big empty space? Is this normal for day 13? My other eggs look like they only have one black dot moving in them.