Robert
It seems to me a pokeweed seedling.
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A weed is just a plant growing where you don't want it to. If you don't want it, remove it, it's simple. For what it's worth it does look like a pokeweed. The seeds may have arrived by being blown by the wind, dropped by birds, who knows? Just pull 'em out.
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It think it's a pokeweed seedling. The seeds are very commonly spread by birds and the seedlings seem to come up everywhere.
https://en.wikipedia.org/wiki/Phytolacca_americana
don_sv_az
It might help if we knew what you planted and intended to grow.
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take a sample to a garden supply store & ask them .................