it looks like Mouse eared chickweed to me too. Very common to find it very early in the year, as even a few weeks ago in zone 4 it was practically the only green plant. If there are random ones in the garden, I could be certain, but if this is the only one, you might want to let it grow some more and be sure.
I thought it might be a Myosotis (Foret-me-not), but I see your plant is opposite leafed. Myosotis is alternate.
