Ok, I guess just leave it alone.It'll probably be fine. i open the lid about every day for a few minutes to let some humidity out. It's perfectly fine to do that. Mama hens get off their eggs daily to eat, drink, and poop.
38.4 C or F? They need to be 99.5 F. Humidity should be at 45% for wet hatch, or 35% if you're doing dry hatch. If you're doing dry, boost humidity to 65% for lockdown.
Good luck!!!