ok so I haven't had my period and it's 36 days late I need help

Ok so I'm 13 and I've only had my period for a year and i am definitely NOT pregnant! But I haven't had my period in 36 days like I've missed 2 cycles and I was to get it last month but I didn't and I was also supposed to get it last week but I still hasn't came yet. So I looked it up and it said if u missed a cycle it could have to do with working out and I did make the JV team for high school soccer when I'm only in 8th grade so I'm pretty proud about that, anyway I've been having practice every day so is it because my exercise schedule has changed idk I need answers or opinions😬what do I guys think??