Our first time incubating. It's kind of a test run for DD's science fair project. We set 6 eggs. Two ended up being duds. Two other showed nothing but blood rings at about day 12. That left us with two that showed good development. We saw movement up to day 17. Day 21 was last night at 6:30. There's no rocking or chirping. I'm using a borrowed LG still air. Humidity for lockdown has been stead at 65 and temperature has been between 100-102 with one short spike to 104. I'm sure there is still hope, but should I do anything? At what point do I give up?