Confused? And scared?

I took plan b last month as a precaution my boyfriend and I had protected sex and the condom had no holes but we were still worried about discharge around the bottom that we now know was mine now. After taking plan b I had my period around my regular scheduled time. This week I’m supposed to get my period and I haven’t yet. I was supposed to get it today but I haven’t can I be pregnant even after I’ve already had my period after taking plan b contraceptive?