Ugh why again?

I started rosuvastatin in August that threw my period off last month making it super light for 4 days then heavy for another 5. Now here we are in October and it hasn’t showed and I have very little symptoms. We use condoms every time and avoid sex around my fertile days. What is the likelihood of pregnancy and can my meds still be throwing it off? Im always regular but the last two months my body has been off.