I do not usually get nosebleeds. Tonight I went to an aerobics class with a friend (I do not usually do a lot of aerobics) and halfway through I got a nosebleed. The bleed itself wasn't that bad - it stopped after a few minutes. However, I was a bit concerned when I brought up some blood from the back of my throat and when I spit it into a tissue there was a large blood clot. Is this cause for concern and should I see a doctor?