My big fluffy blue cochin is setting for the first time. She started with a dozen, kicked three out and has been solid on there for 20 days. The eggs are from an egg farm down the road. They had about 60-75 hens, but only two roosters. They assured me the roosters were very active, but I have no idea what the chances of these eggs being fertile are. I haven't candled or anything, just checked to make sure there were no broken ones. Do most chicks hatch right at 21 days? I am so excited!!