Problem

My bf and I planned having sex for the first time ever this weekend. I started BC a month ago and my doctor said the BC will take 1-2 months to start working and it’s only been a month. We also r going to use a condom but now I’m worried. I just finished my period so I’m fertile starting tomorrow. Even tho I’m using protection I’m scared I’m gonna get pregnant. Do u have sex when ur fertile? Will I get pregnant??