air sack question? still need help please!

[streemers]

okay so i was just canldling my eggs and in 1 of the eggs the air sack is darker then normal with a white normal color circle in it. the circle doesnt looks seperate everything looks normal with it except the whiter part. it also has a hair like crack in that area but so far that hasnt stopped it from developing correctly. all my others have a normal white air sack. any ideas?

im getting worried it might blow up and mess up my other 3 eggs....
any ideas would be sooo welcome!!

 

[Katy]

The dark part might be bacteria growing in it...especially if it has a crack.

 

[streemers]

they are due to hatch the 22nd and i can see little flutters in the small space you can see in at this point. do you think it might not make it to the big day?

the air sack is evenly dark in the dark area?

 

[Katy]

I don't know...I'd keep a close watch on it tho.