Scared about Pregnancy

So I am someone who just started having sex recently with my boyfriend. Even though it is always protected with a condom but sometimes having it in my fertile window worries the crap out of me and makes me super paranoid about being pregnant even though he hasn’t cum once. How do I tackle this sort of a behaviour? Is it normal to overthink this much? I’m really sorry but I am just super paranoid being a college girl whose parents would get super mad if they even found out about the relationship.