Maybe it was taking a nap!? Lol
LOL, yah, little bugger! I sure hope they all make it to the end!
WyoChickenMamma, If you'll eat them ok, just buy the free range eggs, candle them, take out those that look like they might have damaged air sacks or something, then crack 'em open and see if they are fertile. If all of them are, there is a good chance the rest of them are. If not, just eat them

I got a dozen eggs at TJ's ; 4 had moving air sacks so we ate them, and I checked them before cooking and found them to be fertile, the rest of them went into the incubator. After 4 days I candled and found one was not developing at all, so I fed it to the dog. I checked it and indeed it was not fertile. I later lost one, as I got a blood ring, it must have quit around day 3 or 4. Now I'm down to 6 eggs, but those all look healthy!
I'm also planning on incubating for World Egg Day, LOL. I was planning on ordering Serama eggs around the 15th anyway so it's perfect timing! Good luck! I hope if you try this, you'll find they are fertile! Remember to get the freshest date possible! The eggs are usually dated with the Julian calender, 001 being Jan 1st and 365 being December 31. Just google a chart and remember this is a leap year!