So I have a Brinsea that I loaded up with 24 eggs 3 weeks ago. Two of them hatched what seemed to be very early, on Day 19 and are doing well, today is day 21 and there is nothing. No pips, no chirps, no rocking. What in the environment causes the birds to hatch early and is it possible for them to be this far apart? I'll wait till Monday before I start worrying too much but was wondering what others experience is on the "normal" span between first hatch and last. Thanks!