I'm 12 and I have done that many times I doesn't afect ur cycle
In my opinion, it shouldn't effect your cycle at all. I used to do things like that at times.. Nothing was ever bothered, it just gets really nasty.. And try your best to not do that not because cycle reasons but because the tampon can get stuck inside of you.. Never happened to me but I have looked it up and some had to go as far a going to the doctor and getting it removed so just be careful would be my advice.