It marked the line on the egg to see if it grows and the next day it had moved about 1/2 an inch to the right? It moves a bit when I move the egg. I posted a photo of a line on one of my eggs now long ago and everyone said it's the start of a blood ring, I'm hatching guinea fowl eggs, the egg was 1 week and everyone said I should see blood vessels and a chick, so it was dead, after cracking it there was blood vessels and a embryo.. I couldn't see any movement in the chick, and since then the other line on my second egg has turned into a full circle.. I'm desperate for answers As in if I should get rid of it? But I don't want to make the wrong choice