Test? Or don’t bother?

The ovulation is probably wrong because I don’t track it. It simply costs too much money to track it. So from my period and stuff, when should I test or should I even bother testing? I know my period was long. My periods change frequently and I do have PCOS. I just have a feeling it may have happened this time. I doubt that it did, it’s probably just blind hope. I know it says my period should start on the 8th, but as I said my periods change.