How likely is it?

I'm pretty sure I have PCOS, my periods are irregular (for the most part) and now we're TTC #1 as of yesterday. There's no way of telling when my period is going to come, or even when I'm ovulating. But he did "finish" inside me, which is a start. Any suggestions on how to tell, or when I should test? Oh and I'm 22 if that helps :)