What is the likely hood of me getting pregnant??

Hi so i’m 16 and my boyfriend and I just had unprotected sex. I just recently lost my virginity to him less than a week ago. We also had unprotected sex at the time. (Yes i know i am extremely dumb) I took a Plan B last time and i’m doing it again today. Will taking another Plan B in the same week still be effective?? i’m really worried because my parents don’t know i’m having sex and i’m trying to get on birth control.