Brown Discharge period was three weeks ago plan b

So I had sex with my boyfriend and I thought that the condom broke on us so what I did was I want to be the condom wasn't broken after all but I still took a pill just to be sure for me my period was before that for example like a week before I had sex with my boyfriend and I took the pill so now it's been about 2 1/2 three-ish weeks and I come home from school and I see a brown discharge dark brown discharge on my underwear I thought that maybe it was my period coming early but then it's not possible because I had my period three weeks ago at say so then I thought maybe it's because it took the pill Plan B right but the thing is I've taken Plan B once more in my life because the condom actually broke and I never had a brown discharge so right now I'm really really really scared I don't know with that dark brown discharge means I know that for a fact the condom don't make but I'm still really paranoid anxious is there a possibility for me being pregnant