I had a nose piercing last week every and now iam getting a clear or white colour discharge from my nose, it is continuous and im unable to stop it.

Nasal discharge: Your nose piercing and the device that you have in the piercing are an irritant to the nose and your nose is trying to get rid of it like it would if you had a foreign body in your nose. The easiest thing to do is simply remove the nose ring and give your nose some time without the metal. You could be allergic to the metal in the device, in which case changing to another metal like gold/platinum.