Girls only: Period Question?

Question

I started my period at the age of 12 and for the first few months it was usual like every month for 5 day i would be bleeding but now for sum wierd reason its a pattern i have my piroid one month for 8 days then 1 month later i get it for 2 days so the pattern goes

if it helps im a virgin

under the age of 15

Answer 1

can a GIRL help me on http://www.maybenow.com/Symptons-for-my-first-period-q23981768 (someone thats had there period)