My nose was bleeding

My nose bled and it wasn't hurt but it was bleeding. I don't know why but when i was browsing my facebook, suddenly i felt there was something crawling on under my nose. Mmmm...and i use my finger to touch it and when i looked at the fingers, i saw blood on it. I was very shocked and it was a bit scay because i never had it before since i came in the UK. Anyway, i just managed to wipe it off using the tissue on my desk before the blood dropped on my pant. After wiping my nose i went to the bathroom and washed it up. Few minutes later i felt my nose a bit sore. Mmmm...but an hour later the sore in my nose was disappeared. Thanks God! Or i will go to the university for a medical check.