I get those too - most definitely a weed but can’t remember what it is. Makes tons of seeds from those tiny flowers so hurry and rid.
This weed is attractive to 4-lined plant bugs So I do sometimes use them as trapcrop in spring-early summer— 4lined plantbugs are horrible to mints, oregano, lemon balm, etc.
I'm afraid I don't what it is either, but these grow all over the place in northern Illinois. It's definitely a weed. It propagates very quickly and successfully.
The good news is that it's easy to pull out. And if you pull them all out, in future years you'll have only a few to pull out going forward. So as weeds go, it's a very easy one to control.