A brownish-red discharge, what could it be?

My little brother and I were playing around and his hit his shoulder into my pubic area. It hurt like nothing i've ever felt before, and when I used the bathroom a sticky brownish discharge ws on the toilet paper. I know its not my period because thats not for another two weeks. What could it be? Please answer.
Update: So it was just that time when i used the bathroom. so can a period start for just a second and be done? sorry it never happened before.
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