I think I could be pregnant

I’m probably overthinking this but that’s who I am. I had sex today we used a condom but I am not on birth control my appointment to get on it is at the exact 2 week mark. My parents obviously don’t know I’ve ever had sex. My mom will most likely want to come into the room with me where they always ask if their any chance you could be pregnant, and well I have to be honest. I’m so scared my mom can’t know and I definitely do not want a child at this time . Any tips ?