Russ Lessa
Russ Lessa voted up Gator Blu's answer

The first year I got my period I was always moody, except the first day or two of my period. Then I was just ill. Your body is adjusting to the new hormones and it is quite common to be moody through that. You'll even out soon enough. 

Russ Lessa
Russ Lessa voted up HappyTwo BeHereTwo's answer

Yeah, it's quite common.  Actually, high hormone surges occur during ovulation which occurs at about the halfway point between periods.  The moodiness that accompanies it can last for a couple weeks.  You may want to look up PMS.  Your hormones go crazy throughout puberty, and mood swings are often more intense during these years. 

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