Period confusion

So my period is 2 days late however im confused if it came already. So my boyfriend and i had sex on November 18 at the end of my period and i took a plan b then a week later on the 25 i started spotting which ik is a side effect of plan B then it got more heavier and heavier and i needed to use a pad that lasted for 4 days however according to glow my period was supposed to come two days ago and it's not here yet i don't think im pregnant because i took the plan b and i didn't have sex at all this month im just wondering has this happened to anybody else?