How do I tell him I'm pregnant?

My best friend got me pregnant. He expressly told me he doesn’t want a relationship with me. I haven’t told him that I’m pregnant yet. I want to do it in a cute way, but I’m also afraid he’s gonna freak out. I’m excited. He’s my best friend – I think raising our kid will be awesome whey her he wants to play daddy or not. I’m just afraid he won’t want anything to do with the baby or me, or maybe feel like I’m trying to trap him.
I don’t want a romantic relationship with him, forcing someone into that would make it feel so tainted. But…. how do I tell him what’s going on without ruining our friendship?