This egg is on day 10 of incubation. It shows developing blood vessels, however the air cell is on the side of the egg. The egg was stored properly (fat side up and rotated 3 times per day), and was 8 days old when put in the incubator. None of the other 30 eggs look this way. What could have caused the air cell to be on its side? I assume the egg won't hatch and I should remove it?