I stubbed my baby toe 3 weeks ago. It's really swollen but doesn't hurt. What should I do?

It could also be. infected, so you probably should have it checked by your doctor, if it's not improving.
Depends. A "stubbed" toe that is still swollen 3 weeks later may still be broken and out of place (displaced). It could also just be residual swelling that will take longer to go away. If it is pretty much lined up and you are getting by with it, there isn't a real hurry to see anyone. If it is still like that in a few weeks, then i'd recommend getting it checked out.