nervous

Ellie • I am a 15 year old musician ! + I have pink hair:-)
so I started a new pill 3 months ago , and on the 3rd week of being on it I had sex . he didn't cum in me but we still didn't use protection . my period didn't come , but I had this brown discharge for a few days . then the next month my period " came " for like 3 days and it was light . could I be pregnant or could it just be my pill effecting my body .