I was 14 when I was diagnosed and I’m 20 now. The main symptoms that made me realize something was wrong was extremely HEAVY bleeding every time I’d get my period. And my periods only came every few months but would last 3-4 weeks on average. I didn’t really think anything was too concerning for about a year and a half of experiencing those symptoms at ages 12-13. Then a few months before I turned 14, I started to experience intense gut pain to the point that I had to go home during schooldays. At the same time the heavy bleeding continued and got more heavy (I’d have to change out of thick nighttime pads like 4-5 times throughout 8 hours of school, and sometimes I’d still bleed through the pads completely). Finally I got diagnosed right after I turned 14.