Brown discharge?

So I'm 14 and have never missed a period. I started having periods in around 5th grade. My last period was 17 days ago. I never have a set time my period comes, and the only really irregular thing is when my period comes the last three days of a month and the first 3 of the next month. But then I proceed to have a period that next month even if part of my last one drew over.

I'm a virgin and recently i thought i began my period because i had brown discharge and really bad cramps. And the discharge smells bad. I don't know what it is or know if its supposed to be my period since i haven't had one this month. If anyone could help me id be very grateful.

The only time anything is ever brown is the last few days of my period from the leftover blood. So I'm very confused.