Duckling bleeding from butt!!!

[DramaticDucks]

I have a 8 week old call duckling.
First I brought it outside for a few minutes, it was looking at me weird and staring into my eyes. Then I picked it up, it’s butt was wet I figured it was just some poop or something so i didn’t think much of it. Then i went to put it back in its brooder and went to wash my hands then i saw there was some blood on my hands.
I can’t see anything wrong with it and it is acting normal.
What is wrong with it and what should I do?!

 

[Wyorp Rock]

How old is she?
Was the blood coming from the vent or could she have had something like a broken or torn nail?