I’m wondering if I should be worried. I have 7 eggs in lockdown. All looked good when I put them in there. I have my temp at 37.5°C and I have had to wing the humidity because it doesn’t have a humidity sensor. I got freaked out last night because it was day 22 and no pipping, chirping, rolling etc. I candled one egg very quickly and saw the air bubble at the fat end of the egg and the chick filling up the rest. I also seemed to have seen what I think were feathers which is neat! Didn’t see the head near the air sack though...
Click on this link: Incubating & Hatching Eggs
You should be able to get all your incubating questions answered there.
Good luck!