It is possible that it is from hitting your nose, a few years back I got into a fight at school and got punched in the face repeatedly, nothing happened at the time, but for weeks afterwards I had a very sensitive nose and kept getting nose bleeds. It is possible that there is actually a bit of bleeding going on inside your nose, it might not take much, just a little knock, but that might be why you're smelling blood. Of course, it is also possible that it is a hallucination, but I'd only start seeing it as that if it keeps happening without there being any physical explanations for it.
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