Hi Debanslow, I'm probably stating the obvious here, but just because something's considered to be a 'weed' doesn't necessarily mean you don't want it in your garden. For me, it all depends on whether I like it or not, and how easy it is to control. It is possible to let something flower without allowing it to set seed, if you're on the ball 
I've pulled up various 'weeds' which I've later discovered were rather beautiful. Wait 'til it flowers, see if you like it, and if you don't, then you can pull it up.