should I give an egg in the incubator before I call it done? I have one left that I put in on 10/3. The one other two from 9/29 and 10/2 hatched right one day 21. I candled tonight and there is a large air cell but you can still see some veining at the lower edge of it and where the chick is. While I didn't see much movement, at the top of the air cell I could see some pulsing. The other two were all chick and air cell at day 18. Should I leave it alone for another day or two?