2 periods within 3 weeks also sudden sharp stomach pains

I have had two periods within three weeks, also have sudden, sharp stomach pains. What is going on ?

I have had the same thing happen to me.It hasn't happened before!

I'm 19 and still a virgin but I was masturbating a day before I got my period for the second time. I noticed short sharp pains around my stomach. I'm worried as I've never had sex and I'm not on the pill.

Help please! What has caused this second period in the one month?

stress most likely, i once had my period for 3 weeks because of it, its normal, if you've moved recently or gotten a new job, even hanging out with different females can make it happen.