Blood spots in Polish eggs Day 17

[Chronic Incubator]

Hey guys. I candled my shipped polish eggs today and one has weird dark spots. They look like they'd be blood clots if I opened the egg.
The one picture from the air cell end of the egg, the spot moves when the chick does, but it doesn't look like an eye.

The second picture is with the light on the pointy end of the egg. What could they be? Am I going to lose this chick?Thanks for looking.

 

[nchls school]

Please show a side view of the egg being candled. Hold the light to the side.

 

[Chronic Incubator]

Please show a side view of the egg being candled. Hold the light to the side.

Here are additional photos.

 

[nchls school]

The second to last picture shows me what I wanted to see; red veins. The egg is alive and growing. I can not tell you what the spot is; part of the growing chick? I wondered because the first pictures looked to be dead. Veins break down quickly so when you can see them with a distinct line between the air space and the embryo the embryo is living.

 

[nchls school]

Your pictures look is if they are showing different eggs.

 

[chickens really]

@WVduckchick

 

[WVduckchick]

How long have they been incubating?

 

[Chronic Incubator]

Same egg.

 

[Chronic Incubator]

How long have they been incubating?

That was day 17. Today they are hatching. 3 of 6 so far. One pip on a fourth egg.

 

[aart]

Curious to see what is up with the egg with the 'blood spot' in it.