weedling or seedling

I have scatter planted my hugelbed with so many seeds that I am unsure.  Can anyone confirm that this is a weed, likely from the horse manure I added?  This stuff seems to be everywhere.  I planted some Amaranth varieties (new to me), but cant think of any others.  As near as I can tell it is pigweed, which I understand to be an amaranth... so I am confused or at least hesitent to pull them out. 

Perhaps my form is off, here.  Is there a better place to have posted this question?  If so let me know. 

Thank you as always.  Happy longest day to all!

not the greatest photo but it LOOKS from that photo like it could be lambsquarters which is an edible weed, I love it, it tastes like spinach when steamed..you can also can it.

It generally grows in recently overturned soils

thank you very much.  I will investigate.  I really appreciate your feedback