[gladis]

i cracked open a large egg today to find 2 yokes and a lot of blood not sure what bird laid it is it a worry

[bantam novice]

Hello Gladis,
I am not terribly experienced and I'm sure someone more experienced will be along to advise you.
From what I have read on this forum double yolkers do turn up.  They are nothing to worry about. 
I'm not too sure about the blood.  I think that that sometimes happens too.  If your hen is eating, drinking, Poohing and behaving as usual I don't think you need to be too worried.
You may want to try checking her vent.