bleeding after plan b?

i took a plan b about 5 days ago, and then last night i had sex and shortly after i noticed i was bleeding but veryyyyy slightly. i figures my vagina had just got a little torn from the sex. but this morning there was more blood and it’s very bright red, like i’m on period just not as heavy. there’s no pain though. is this normal to have after taking a plan b? or could it be from the sex? idk if i should be concerned. and i’m not on birth control