Intimate too soon, how to say "slow down"?

Yes, so long story short (I can always give more details if needed) i went out on a first date with a guy and we had sex after. We connected a lot and talked about so many different things, so in the moment I thought whether I would regret it or not and I decided it was what I wanted. I don't have any regrets at all about what happened, the only thing is I never do this this fast with a guy I actually like. At the end, after he drove me home, he got my number (we "met" on social media - not a dating app or anything) and there haven't been any booty calls or anything - just a "hey how are you" kind of text. I want to tell him I want to get to know him before/if we do that again, take things more slowly, but is that something I say in person on a second date, or is it okay to say over the phone on a voice message or something?
Intimate too soon, how to say "slow down"?
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