In janurary, we experimented with 3 eggs in an incubator, and we got lucky and had all 3 hatch and the chics are getting big and doing well. We have put 14 more eggs in and they are due to hatch next week. i know that not all of the eggs always hatch and i have heard that they may come a little early or a little late. I was just wondering how many more days should i leave the eggs in the incubator if they don't hatch on day 21??