Period

I am 15 years old, and my period ended 9 days ago. However, yesterday I was getting some cramps. I thought nothing of them, since my period ended a couple of days ago. But I woke up today to find that I have started my period again- 9 days later after my previous one. 
Is this normal? I'm not sure what to think of it really. I'd like to think it is a period, since the bleeding looks as if it would be a period.
Also, I haven't had sex.

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