later hatching eggs, can it still hatch?

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i had 6 fertile incubating eggs in my incubator, 5 of them hatched so fare the were supposed to hatch to day and one tomorrow, but some hatched a day earlier. so the last one is a black star egg (mixed with a green layer roster) had two of those eggs in the incubator one hatched yesterday. the last one hasn't even got one of those pip marks on it yet. can it still hatch? (today is day 21)

 

[austintgraf]

What type of Incubator is it?? Still air incubators are know to have dispersed hatches, I had a dozen due a week ago. Half hatched two days before the due date, the other half two days after the due date. I'm by no means an expert but I personally would give it another day or two. Just a thought.

 

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it a hova bator 1602-n with a PC fan. temp varies from the middle to the side a little bit. just worried because the other egg from the same chicken hatched a day early.