I have PCOS. It was only diagnosed after 2 years trying unsuccessfully, though it was pretty obvious I had had it since puberty. I had a period every other year (at best), hirsutism, and put on weight if I so much as looked at sugar.
I was on Metformin (can't remember the dosage) which regulated my periods to every 32 days. I was also on low dose Thyroxine as my "normal" TSH levels were above what the fertility clinic said was optimal for conception.
I did conceive naturally, but it ended not long after in miscarriage. A year later I managed to lower my BMI enough to get Clomid, on which I conceived on the very first dose. As a PP said, multiples are a risk. At the ultrasound to see if the Clomid had worked there were two mature follicles present. Luckily, only one was fertilised, and she turns 5 in September.
Once we decided to try for our second, I went straight back on the Metformin. TSH bloods showed I didn't need TSH this time. I also took Inositol, as I had heard good things about it. Apparently it works the same way as Metformin, but you can get it as a supplement (I was taking myo-inositol from Holland & Barrett). I was fully expecting to need Clomid a second time, when wonder upon wonder I conceived naturally after a mere 5 months. The initial line was as faint as faint can be, so I was anticipating another miscarriage, but it stubbornly clung on. As of 12 days ago, he's now the world's most bull headed 2 year old.
So my advice? Take Inositol. I genuinely credit DC2's conception to it. If offered Clomid, take it. If you haven't had TSH bloods done, ask for them to be done.
Best of luck.