Blood in a chicken egg is often believed to signify it is fertile. This isn’t true. In fact, the true sign that an egg is fertile is a white “bullseye” on the yolk. The blood spot is only a ruptured vessel and they are perfectly edible.
Source: Backyard Poultry, February 22, 2021. Link. Different colored chicken eggs all taste the same and look the same inside. The taste of an egg is determined by the freshness of the egg and the overall diet of the chicken, not by the breed of chicken or by the color of the egg.