No, the fertile one. Where the yolk has expanded but no visible veins yet. Yes, my 10 day old incubated eggs look like the fertile 4 day incubated egg on the first page with no visible veins. I have several eggs in the incubator and a few look like they are infertile, a few more look like the fertile 4 day old egg and others are at varying degrees of development. It is a staggered hatch because I collect the eggs for a few days or until some hatch and I can fit more in the incubator.Do you mean the 4 day infertile pic? Are you saying you see no red lines? If it still looks clear at 10 days, you can leave it for a few more days, but by 10 days you definitely should have some visible veining. If you meant that your 10 day egg looks like the 4 day fertile pic, then I would leave it in. Maybe you just weren't getting a good view at the time.