1 month post rhinoplasty and hit nose, still swollen 3 weeks later.

Recovering from rhinoplasty is a healing process. Part of that process is protecting it while it heals. Minor bumps can happen and it will hurt. As long as there are no major changes in the appearance and no bleeding, it is unlikely you caused any damage. I recommend seeing your surgeon so they can check on your nose and give you reassurance.  Even without a bump, the nose, especially the tip will take months to settle down. It's important to follow your surgeon's instructions and keep your follow-up appointments so your surgeon can track your progress toward a safe and happy outcome. Safety comes first. 

Everyone hits or "bumps" their nose after their rhinoplasty. You probably did not hit it hard enough to move any of the framework and since you are still only a few months out from your surgery your nasal tip swelling is most likely normal post-operative swelling. If you are scared the best thing to do is to check in with your surgeon and have your nose evaluated.