I have three duck eggs that were set around 5 o'clock on February 22nd and today would day 21 for them. They have been rocking back and forth for about 2 days now, and today I listened to them and one you can hear pecking at the air cell. The one hasn't pipped yet and the others I think are still getting into position. Will they be okay? Also, should I raise the humidity now, or wait till one pips?