I agree that it's too early for crabgrass for most of the US.
Crabgrass needs soil temps in the 70s to germinate, which is why it's
not a problem most places until 2-3 months from now.

If it is crabgrass, Aclaim is the best product I've found. It's not a
typical retail product that you'll find at home centers. You need to
buy it at an agri supply type place, like Lesco.