I feel dizzy after losing a minuscule amount of blood?

I accidentally scratched myself. When I stood up to go get a band-aid, I all of a sudden felt light-headed and nauseous. I am not afraid of blood or bleeding. What's going on?
Update: Seven in One Stroke: Makes sense, but this is the second time it's happened. I mean, that's probably all it is but y'know...
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