High levels of testosterone and BC

Hi,
Im 17 i have high levels of testosterone, and it gives me facial hair and acne. The doctor said i need to start the treatment. We though it was pcos but thankfully nothing in my eggs. They were healthy i have my periods regularly. But i also wanna start birth controls, would it be a good idea? Or would it even screw up with my already unbalanced hosmones. 
I might also get treated with birth controls but, would the same birth control prenevt me from getting pregnant, or is it just in low dosages anf only regulates my hormones