So I've been on birth control for over a month and I still haven't had my period?

I'm 18 years old. I was diagnosed with Cystic Ovarian Syndrome which I hear is very common.This syndrome is where I make to much testosterone. So basically my gyno said I have to be on birth control long term. No problem. But I've been on the pill for over a month and I still haven't had a period. I'm not sexually active. But I am worried about not having my period yet. Can anyone give me a little in site.