am i pregnant or do I have pcos?

Crisbel
So my husband and I have been TTC since May, so far no luck, but I had my last period September 30 and I haven't got it since then but all the pregnancy test came negative, is it a way to know if it's normal for me?( my cycle is usually 36-42 days). My sister has pcos so I'm thinking maybe I have it too.