Help😅

So my boyfriend & I accidentally had unprotected sex and he came inside me but I am on birth control but a mini pill so not an estrogen high pill and I missed taking it the day we had sex but I took plan b within 24 of the sex because it was supposed to be one of my fertile days but nothing happened after I took it and I'm supposed to get my period on the 5th but idk if that'll happen. What are the chances I'm pregnant