The fact that the bump feels soft is a good sign. Most likely it is just a swelling, which is very common after rhinoplasty. Just wait it out at least 6 months and see. If the hump still persists and is bothersome, you may consider either a small revision or to caumuflage it with a filler.
At one week, you just need to be a patient. I do not see much in the photo.
Kenneth Hughes, MD
Los Angeles, CA