Frustrated at life right now.

Amie • 28, married since 2014 and trying for my second child. Have one tall healthy 5 year old boy.
So when I was 22 years old I had my son and seriously it only took the one time and I got pregnant. Now almost 6 years later I am trying for my second and I been diagnosed with pcos :( how did this happen to me and why. I can't help but blame myself. And I had my first miscarriage after a successful round of clomid :( I feel so let down. I just want one more child. How is it that some women just keep popping out babies left and right and others can't.