Scared boyfriend!

Okay so a few days ago I found out I was pregnant! Completely unexpected. And I know I 100% wanna keep the baby, but my boyfriend does not. I tried to explain that it’s not gonna be as bad as he thinks. I just fear that he’ll leave me for keeping the baby. But he seems confused about or like he hasn’t fully processed it yet. Like the other night he was concerned with how many tums I was eating for my heartburn and today he just says he’s not ready for a kid. Which I understand. I just don’t have it in me to get rid of the baby, I can’t do it. Has anyone else had this problem with their SO? Did they come around to the idea? What happened?