Nose bleeding generally could be due to simple causes like injury due to nose-picking
, common cold
, allergy etc or Rarely ,it may be due to some blood disorders,drugs induced, high BP etc .
If your nose bleeds again,pinch the nose tight for 5 to 10 minutes and to breathe from the mouth during that time.
You may also put an icepack and sit with your head leaning backwards.
Do not bend forwards.You can also use a decongestant nasal spray
.This will help to stop the bleeding.
I would suggest you to approach the ER if the bleeding is not stopping, it will require nasal packing to control the bleeding or drugs like Botroclot 4 drops into the nasal cavity
also helps in stoppage of the bleeding
If the bleeding still persists, consult an ENT specialist