How do I make my ex miss me?

We’re both in our mid 20s. I’m 3 months pregnant, yes it’s his, before anyone asks. We broke up exactly a week ago. We were together for 11 months.

We both don’t have social media, so I can’t use that to make him miss me or anything. And this “no contact rule” either since we are expecting.
He told me he’ll be giving me money each time he gets paid so I can save it for our baby, since he’s bad with saving. We have hooked up a couple times since the breakup.

Back when we first starting dating, he always wanted to see me, he couldn’t go a week without missing me. But how can I get that back? How can I get him to miss me? Any tips please.
How do I make my ex miss me?
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