LADIES ONLY: I've had my period twice this month... am i okay?!?

Okay, so I am 13 years old and I started my period for the first time in March (this year), and so far my period has been iregular (like it's supposed to). But, I had my period on June 7t, and it had its 7 day cycle, but today I started my period again... is something wrong?! I knew my period was starting soon (my period calendar said July 5th), but I just didnt think it would start again in June. But just to give more detail, when I had my first period it started at the end of March... maybe its starting its pattern? I have no ide, and I am REALLY REALLY freaked out and scared so please ladies help me!!