TTC with PCOS

I have been ttc for 7 years. I have pcos and my doctor said it would be "extremely hard to damn near impossible" for me to get pregnant. 2 years ago. May 1, 2015 i ended up going to the hospital and found out i was miscarrying. (I never had a positive even after taking thousanda of tests) I was happy because I realized I was actually pregnant but upset because I was losing the one thing I have always wanted. My ex husband was endlessly abusive and we got divorced and for the past year I have been dating this guy but havent seen a positive. Whats wrong with me? Am I doing something wrong? I just want a baby 💔😭💔😭💔😭