miscarriage & plan b?

i had a miscarriage on the 3rd and i had sex with my boyfriend 2 days ago and last night & im not quite ready yet so just to be safe i took a plan b, i understand that they said to not have sex until my next period but they said everything looked fine . i was just wondering like i heard you were really fertile after a miscarriage so i’m hoping this works . when should i expect my period...?