Sometimes the BCP will not help with PCOS, as a lot of PCOS is due to what is known as insulin resistance. This means that your body is unable to utilise the insulin that is around, so Metformin is usually the drug of choice to help this and people notice an improvement on this. This needs to be combined with dietary measures also, such as diet and exercise to loose weight if you need to.
You need to get all your hormone levels checked, such as estrogen, progesterone, Lutenising hormone and follicle stimulating hormone and also get blood sugar levels checked to see what kind of treatment you need. Also, an ultrasound scan of your belly will pick up ovarian cysts.
Go to your doc and get all these tests done first and then take it from there.