How soon..?

Rae • 21, TTC for baby #1, suffering PCOS, waiting for metformin/Clomid
I've had an inkling that I had PCOS from a fairly young age - (my cycles started at thirteen, and was definitely not normal) - but my fear of doctors put me off seeing a doctor. 
Last month I bit the bullet and went to the GP, had a blood test - which came back as normal, and then had an ultrasound on Wednesday, which confirmed PCOS.
I was wondering how long it may take to be prescribed Metformin or Clomid to get the ball rolling..? As SO and I want to start TTC in the next two years or so.
Thanks ladies ?❤️