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If you saw a vein full of blood (tiny though they are) it still needs to be absorbed.
This is the one I helped and she looked like that 24 hours after the first pip. She should've zipped around the egg by that point and just wasn't making any progress. She has a slightly deformed toe and I'm thinking there was something wrong with her position in the egg that made hatching difficult for her.
This photo is from a hatch earlier this year. If you look inside the egg, you can see what remains after the hatch. You can see the little blood vessels, but they're empty as all the blood has been absorbed.
I'm no expert, but these things vary greatly. It's like having a human baby, some babies are born shortly after the first contraction, some take days! Just pay attention to the progress and the behavior of the chick. If it seems to be in obvious distress, then you might want to give it a hand. But be careful not to try to help just because your an anxious new parent as you may do more harm than good.
There is a school of thought that says if it's meant to have trouble hatching, it's Natural Selection and it probably is too weak to survive anyway.
I only had two eggs develop of the 7 that I started with initially. Here's a link to the thread I had about my last hatch. It was drama-filled and will give you something else to do besides worry about the little guy!
https://www.backyardchickens.com/forum/viewtopic.php?id=323669
You're doing the right thing by paying attention. Watch the humidity. If you have a squirt bottle with a fine mist, give a little squirt if the humidity isn't where it should be. Let the chick do its thing and try not to worry (too much).
