Sex without protection Plan B?

I got a plan B right after doing it unprotected and him finishing inside me (still have not taken it)...I am Not ovulating I just got off my period a few days ago. I am debating rather it is necessary to take the pill because the chances might not be that high anyways and ive heard the pill is bad for me so im like y take it ? I dont want to get pregnant at all though. What do y’all recommend?