In this video notice how the top of the air cell has moved over towards the right which is the pointy end of the egg...
And notice the shadowy movement at the bottom of the air cell.
That movement at the bottom of the air cell happens before they internally pip.
The internal pip is the beak...
Yes they absolutely do need to be calibrated.
Can you wait until it gets dark in about an hour and then take a cell phone flashlight and shine it into the air cell.
Give me a few minutes to find a video or pictures of what you should see at this stage of the game.
I want you to pay attention...