Really anxious don't know if I am?

had about 2 mths ago took plan b and had a light bleed a week later. Don't know if this was my period. Started on the pill on the first day of the bleed and had a normal withdrawal bleed. doc told me to come off the pill due to bp. Anyways my period is late and have bn taken oxycontin for the past week and i've developed a horrible metal taste in my mouth don't know if it is the drug as it is a side effect or could it be pregnancy. what you think