Is it my period or pregnancy

So I took a plan b in January like kinda in the middle or January. I haven’t started my period in 11 days I do have discharge, but it’s not like normal period blood. It’s kinda reddish brown and I’m only spotting. I’ve asked my friend for advice and she said it was because of the pill, but she’s not a doctor. Lol. Please help! I don’t know if I’m pregnant or it’s my period!!