Took a plan b an panicking

Me an my boyfriend had unprotected sex he didnt get to ejaculate because I stopped him but i was worried so i took a plan b the next day within 24 hours and 5 days later i got up to 4 days of semi heavy bleeding and then it ended.....now i have no clue what to do im scared and i cant say when my period was supposed to come because its irregular please somebody help me im scared.