You set these on a Friday didn't you? I think. Which would mean today is day 16? Around day 15 the candled eggs should look pretty dark and it gets hard to see anything. The chicks are starting to fill the entire space up. The cells look really good, I think things are on perfect track to a good hatch!! Definitely go back and count the days, day 1 is the day you set. On day 18 stop turners, open vents completely wide open, pipping chicks need a ton of oxygen. Lay down some sort of non skid material so chicks don't slip and get splay leg. I like to use the rubber shelf liner with the little holes in it. Get your humidity up around 10%-15% higher than it's been or somewhere around 65%. If it's too low, chicks can shrink wrap and stick to the inside of the shell and die, or the shell and tissue inside the egg gets too hard to pip through. I have trouble in my arid climate and I always end up putting a small cup of water inside the machine with a piece of a clean kitchen sponge in it to wick off humidity.Update day 14 (or is it 13, now I'm second guessing and need to check the calendar) anyway, I have a few eggs I've been weighing and a few I've traced the air cells.
Here are the air cell photos, do these look good for day 13 / 14?
They've been much darker inside than the informational chick development egg photos, but I'm seeing healthy veins and movement so I think they're ok. Trying not to stress, I've got that in abundance at work already, but I'm really wanting to do perfect for these little growing peeps![]()
I am super egg-cited for hatch day!!
The air cell size isn't horribly critical, as long as there is a decent sized space for them to breathe oxygen after internal pipping. I would maintain your moisture so they don't get too much bigger before lock down. Oh and nice chart! Nice to see what grows when!
But yes, they frequently hatch early and it's perfectly fine to go into lock down up to 5 days before hatch if you get your days mixed up. I like to have everything ready ahead of time, I tend to be a "fiddler" with things so I need time to fuss with lock down. 

