Plan b

So I had my regular period and when that was over me and my bf had sex and then stuck it in without a condom because he's stupid 😒 and then took plan b just to be sure, and that was a week ago and I think I have my period again, the information paper says it can cause periods to be early or late, but I'm just asking has this happened to anyone else, is this just a normal period or am I exploding