I see a bullseye on the left hand egg. And no, I don't think you ever have to worry about blood spots, unless they're big and/or constant, which might indicate a health problem with the hen. My eggs occasionally have spots in them that vary from medium dark red to almost black. Doesn't affect the taste at all. I'm not sure if it affects the fertility. I'd guess not, as I crack open all infertile eggs from my incubator and have a look at them, and I've never found a blood spot in one yet...