How late is late with PCOS?

The subject is self explanatory, and because of PCOS, I never know when to worry. I had a tryst with an ex and in eight years without protection, we've only ever had scares and the pull out was more than effective because of how hard it is to become impregnated with aforementioned disorder. I've been up to a week late before, but I'm just wondering how late is late with PCOS? Anyone have any experience in this? Should I wait a week, two, or three before running to the drugstore for a pregnancy test?

Thanks so much! :)