So I'm 13 now yay!!!! 😀😀😀😀 I got my period last year. And I haven't gotten it since November. I'm not sexually active cuz who would be at 13. I just started a new medication for my ADHD could that be the reason it's irregular. I get really anxious and I have really bad anxiety and I'm really worried. I know I'm not pregnant but I just want to know what's causing this.