Paranoid about pregnancy

I’m in high school and I’m constantly stressed out because I always think I’m pregnant, I’m on birth control (and i take it religiously) and when I’m on my off week I use a condom.but I just have sex so often(with my boyfriend not just random people 😂)I can’t help but think it. I regularly get my withdrawal bleed but because it’s not a natural period I still think I’m pregnant lmao. If anyone has any words of support or statistics/ facts that could make me less anxious I would sooo appreciate it. :)