Is this a blood ring or a vein ?

[Caseyjane14]

There is definitely movement but I feel like this looks like a blood ring? First timer

 

[EggSighted4Life]

There is definitely movement but I feel like this looks like a blood ring? First timer

Those are veins!

Image example from google..

 

[HollowOfWisps]

That circle shape is the blastoderm diving into cells and expanding.