Boyfriend into pregnancy Porn?

Just recently got off BCPs and my bf is all like ooh maybe you're pregnant, are your boobs getting bigger? Anyways he's all excited about the idea, I'm terrified, then I'm on the computer and check the browsing history, I don't use the computer that much and my b f's taste in Porn is pretty predictable except this time he's been watching pregnancy Porn, I'm a little weirded out about it honestly when usually I could care less what he's jacking off to.