Firstly ask to see a different GP, mine is excellent and pushed for a diagnosis. Secondly, i have PCOS and have been pregnant 3 times, my first was very prem,as was my 2nd but he survived and i have just had a little girl.
I lost 3 stone, took me ages due to my ovaries, and then i fell pregnant, my gp said that losing weight helped me greatly in conceiving.
Have you been given anything like Clomid, or other fertility drugs? If not then as i say you should really try and change your doctor. good luck