My boyfriend wants a big family but I don't?

My boyfriend and I want to get married and have children now that we've graduated college (ofc after he gets a stable job). We've been together 4 years. He wants to have a family with 3 children, whereas I'm fine with just 2. He's practically begging me to agree to have 3 kids, but I don't want to since it's gonna be too much for me, and I've always wanted a family of 4. I really don't know what to do. I've told him multiple times that I'm not comfortable with having 2 kids (I'm not judging those who do, it's just a matter of preference). He even said he wants to have a 3rd kid by the time we're 38, when the conception chances are extremely low. I really don't know how to tell him that we'll be happy even with 2 children.

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Edit: I'm not comfortable with having 3 kids lol typo
My boyfriend wants a big family but I don't?
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