Female diagnosed with high testosterone levels...PCOS?

I am 27. I have had about 5 periods without bc since I was 13 and have been on birth control on and off since 16 so I would ovulate correctly. I tried many different obgyns to figure out why I wasnt ovulating by myself. No one had an answer. Ive had my thyroid checked over and over and everything comes back "normal". I got pregnant in 2009 on accident since I thought I couldnt without help. I was on birth control and messed up my pills which caused me to ovulate. I had gestational diabetes when I was pregnant. After my preganancy I gained 30 pounds in 2 months. I was still suffering from fatigue and weird emotions constantly. Recently I got more bloodwork done and the result was that my thyroid was fine but I had high testosterone and cholesterol and low vitamin D. I was put on metoformin 500mg. I have an appt with my obgyn to see if I have PCOS. I did my own research and it sounds like I do. Why was I never tested for it in the last 15 years? Can I still have thyroid issues even when the tests come back normal? What tests should I have them do? I want more children. Any advice for me!