I bought a dozed blue laced red wyandotte eggs to hatch out and then added eggs from my coop the same day. They are all on day 11 of incubation. The wyandotte eggs are developing just like they should, but the eggs from my coop are mysteriously clear after candling last night. Could they just have a darker shell and I am not seeing what I should, or is my rooster infertile? He chases the hens around daily and does his job, but I wonder about those eggs.