please help me, unprotected sex

i had unprotected sex on the last day of my period. he didn’t nut in me or nothing and everything was fine. then i kinda started panicking and i took a plan b on the fourth day after unprotected sex(i was thinking about precum). i started my period a week after i took plan b and i know that’s normal, but i’m curious if im suppose to have another period this month too?? also this period i have is lighter and lasted like my normal period do