I am new to hatching as well!
I think you may be speaking of a blood ring. You can use the search feature for blood ring and get way more information than I can tell you.
Hope that helps!
Yep, sounds like a blood ring, if you don't see any veins, you may want to just throw it out as there is a very low chance of it hatching. Good luck with the rest of the hatch! This really is addicive so be ready!