Early day 20 after incubation, day 21 after being laid. listened last nite, heard scratching, this morning a small hole and chirping but the hole is not getting much bigger... the egg is moving and there is still about the same intermittent chirping. About 60% humidity and a constant 99.5. Tonight at 8:00 will begin day 21 of incubation. Should I be concerned about how long it's taking to emerge?