plan B

had sex which dumb mistake wish i didnt but he said he didnt cum inside me sooo i took plan B for extra percausion and it got me so confused like i got my period again that month after takining plan B a week later qns it lasted 5 days and ended on the first of this month but then this whole month i havent gotten it and im hoping it just fucked up my period but im sooooo scared like any advice plssss like does that mean im good and it just fucked up my period and my body orrr...