I believe the eggs that have much larger air cell development like Egg P in that picture are at the stage called 'drawdown'? Anyway, after all the movement and sound this morning, I'm feeling a lot better about it. I was mostly worried about the spots of blood around Egg P's internal pip, but she seems fine for now. 
Yes! I also saw an internal pip. Is it possible that the eggs incubated a bit before they were collected? Some breeds and crosses hatch early anyway. 19-21 days is usual and at day 18 you are fine. they will likely hatch between day 19 and 20Definitely! Now that I've done a lot of furious searching on BYC..
Egg P is in a hurry to make an appearance!
I was expecting them to hatch maybe a bit early just because these eggs are so, so tiny. Definitely was not expecting internal pipping yesterday!
Bantams often hatch early it seemsWe have an air breather!!
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Nope, not possible at all. Sybil and Winston are still penned inside waiting for the weather to finally get warm and stay warm, so no one else could have been sitting on them, and she's only been sitting on them for a few minutes after laying, tops. Just long enough for a few cute pictures a page or two (edit: or five) back.
I set the eggs at about 4 pm my time on the 7th, so right now it's technically still day 18, but it's basically day 19 now. It's only about an hour away, anyway. I may be splitting hairs at this point.
Just a tiny crack on this one, though--hard to get a clear picture of it! Come on, babies!! 
Where are those leg bands when you need em...
I don't know nuthin' about birthing chickens
