I too have PCOS and through research that i have done, i believe that you need to have at least 2 signs of PCOS to be diagnosed with it eg Ovarian cysts & hormonal imbalance, or Ovarian cysts and Insulin resistance etc.
It sounds really slack of your Dr to not investigate further and just write you off as having PCOS.
I havent been diagnosed with PCOS but I have a LPD. My AF's come early - I am lucky to make it to cd21 to do my day 21 bloods. My length of my AF has also changed varying from 3-11 days...
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