Weed???

Could be a blown in carrot seed.
I don’t grow carrots but I do grow daucus - the more ornamental one with pinky/red flowers.
The buds on this are definitely white though and the foliage is more lime green compared to daucus which has a sort of sherwood green leaf.

I think I have one of those carrots growing, perhaps it came from you in a seed swap. It's in its second year now so hopefully it will flower. It has quite a nice purple carrot underneath.