Hii My Name Is Saira I Am 22 And I

hii my name is saira i am 22 and i had sex with my boyfriend on 17th dec and that was the 6th day of my cycle and on 19th i took plan b and he didn't even discharged it inside me .. on 24th dec i started bleeding brown and it turned into bright red later and continued till today 26 th dec pleade help me ...i am worried i dont want to be pregnant :(