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!!