BelovedBirds
Crossing the Road
Thats weird. Gently turn the egg over, so that the pip is on top, and see if theres movement. If there's a liquid substance around the pip, the chick could be in danger of choking/breathing it in.This is what it looks like
If you dont see movement or fear the chick is in danger, then go ahead and widen the pip. Be slow, dont make the hole too big, just enough to get an idea of what is going on. Have a clean dry paper towel to hand, if theres any bleeding, stop and hold the paper towel to it until it stops.
The chick may not be ready to hatch, so again, dont make the hole too big, be patient.
You can read about assisted hatches here assisted hatching
But the goal here isnt to hatch the chick right now, its to ensure the chick is alive and able to breathe okay.
You could use the opportunity to very carefully check on the other eggs, for bruising, pips, or chirps.
Did you calibrate your thermometer? The temp may be low resulting in late hatches.