It's Day 8 and I just candled the eggs. There are 21 eggs in the incubator, which is about a week's worth of eggs from the 3 Leghorn hens. Out of those, 7 had something in them, and 3 of those 7 were iffy. They may be blood lines rather than veins. One of the 4 that remain if you don't count the iffy ones has two dark spots with veins coming out of those spots. That egg might be a double yolk one. The girls started out laying lots of double yolked eggs, but lately they've pretty much gotten away from that. They still do one sometimes. So 3 are looking good.