Confused .. PCOS ? Something else?

My mom has PCOS and I assumed I had it because I get cysts as well but never diagnosed. I get a period every month the shortest its ever been is 3 days. I've taken opks and I've gotten positives and just last week I tested but it was faint which means you already ovulated. I had a Chemical pregnancy two months ago and I am still wondering what's going on and why I'm not pregnant? Please help.