Good luck!!I have a few of each hens eggs and so I think there are 4 variety. Each kind seems to all have similar air cells but they are different from the others. I wish I knew who is laying the darker brown eggs. Those air cells are not growing down but more round if that makes sense. The best air cells are the cream smallest eggs which I think are Silkie. I marked one from the beginning that developed faster so I thought it would be first to hatch. Just put them on lockdown and marked air cells. First line is day 14 and then day 18. The Silkie egg hadn't internslly pipped but I could see its beak pushing it up. I'm nervous I've never done this many! The hens of these are cochin, Mille fluer, porcelain and Silkie. Rooster could be Silkie, frizzle, Easter egger or sebright. I collected these before we got rid of all our roosters except the frizzle. Anyway I'm excited! Oh and I'm also by myself this weekend with my twin 1 yr olds and 6 yr old son. This should be interesting