Pretty sure this is a weed but I wanna make sure. Does anyone know what this is or might be? I think it may get small white flowers on it.
Could be goldenrod (Solidago) which is an important wildlife plant but which is often considered weedy by humans, unfortunately.
Looks like Fleabane, Erigeron, to me. It's a weed, but a pretty one. I've got one blooming near the back of the border right now, most of them get ruthlessly yanked but that one started blooming before I saw it and it looks so nice I'll just wait until it starts detracting from the garden to pull it.
Here is a link that might be useful: Google image results