This is my first time at candling. My eggs are on Day 13....welsummers, BR, and BBS Orp. Some of my eggs are so hard to see into that I've been comparing the air cells to try to judge how they are doing. I have seen movement in some, but trying to figure out the ? eggs. I *think* I have 1 blood ring, maybe 2. So does the air sac expand on a non viable egg?