Missed period, is it the plan b?

My boyfriend and I had sex and the condom broke. I had 5 days to take it and I took it 2 days after. I took plan b on thanksgiving, which was right around the time I should’ve gotten my period. I did bleed for a little over a week but the bleeding was red and brown and kind of irregular. So I don’t know if it was plan b and my period combined? I don’t even know if that can happen. My period is irregular but I usually get it somewhere between the 20th and 30th. I haven’t gotten my period since November (other than bleeding after taking plan b) and it is now December 14th. I heard that plan b can really affect your period and delay it but I’m still worried. I woke up this morning super nauseous and I’m about to go to bed and I’m nauseous again... but I’ve also been very paranoid. I don’t know if it’s in my head and I’m making myself sick. Help!