Can I get pregnant?

So I know you guys can’t answer the question literally but I would like to know if my bf is right. He’s super scared I might get pregnant. We only started having sex maybe 2 weeks ago and I have no kids. I’ve been pregnant before which ended in termination and I did try for 5 months last year to get pregnant by my ex but it never happened. Anywho, he said that all 2 of his kids were conceived from having sex the first or second time unprotected without pulling out and that he was “very fertile” I told him that I am not. He kept trying to argue that I might get pregnant but what I was trying to tell him was that me personally, it seems it takes a while for me to get pregnant so this isn’t the case for me. Is he right? I am 21