How worried should I be about the hen who laud this jumbo egg with blood streaks on it?
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That may not be actual blood on that egg. You don't specify the breed of the hen in question, but some breeds such as Welsummers and Marans lay down a pigment on the shell made up of discarded red blood cells. My Welsummers' eggs often have streaks and smears like that.
Most hens that lay jumbo eggs don't have any issues related to the size.
No reason to worry.