I found i pigeon egg.. i need help please!?

so i found a pigeon egg a little while back, and ive been keeping it heated, and monitoring its temperature, and keeping a damp cloth under it, to keep humidity. ive candled the egg, and now there is a red line around the yolk, then a more thicker clear/white part on the outside of the red line, then theres the rest of the egg.BUT the red line starts at the air buble, goes around the yolk like i described before, but then does not connect on the other side of the egg/yolk. BUT also on the inside of the yolk, there looks like there is another red line, through the yolk, like a vain but very faint. AND also on the inside of the yolk there looks like there is something there, something small though. but also there looks like theres something in the air bubble? i think i remeber reading if there is a red line surrounding the yolk the bird inside has died due to something to do with blood vessels i think, but not possitive. what do you think is going onn??? PLEASE help me :(