Plan B

alexa

So I took a plan b pill around August 20th. Got a small period/ blood from the plan b pill, that lasted 3 days. Then September 14th I got my normal period. But now I am 4 days late from getting my period. I’ve had sex in between these time frames(protected of course) but I’m kinda worried because it’s late. Is it because the plan B still being in my cycle and messing me up or what