I don't know anything about blood rings, I've never seen one. But, what you see now should be clearly visible when you're candling. Turn the egg every way you can to try to see that. If you look at your pics, neither of them show the chick and veins.
With chicken eggs, you see the veins and chick at 4 days. Maybe it was so large by the week you couldn't see it.
Why did you only have 2 eggs? Isn't it hard to regulate humidity with that few eggs?