Don't know how I feel.

So here's my situation. I might be pregnant, I'm five days late and I'm waiting on the doctors to let me know if I am or not. My ex and I, We talked about what we would do if it where to ever happen to us that we got  pregnant. And he doesn't want kids right now and where he is in his life he doesn't want to take the parent roll on yet. So he would want an abortion, and I'm not anti abortion or anything, if it where the right circumstances then I would do it. But  Regardless if I am or not, I'm very heart broken that my ex boyfriend (as we broke up a couple months ago and see each other on and off still).  Would want to have an abortion, he's 29 I'm 23. And I'm at the point in my life that I want to start thinking about kids, as I wanted to start around 25 to have kids. Im soo sad that he doesn't want a baby if I where to be pregnant. He's dead set on an abortion and I don't know if I could do it. I told him I would if I was, but after thinking on it for a few days wrapping my head around it all, I don't think I want to. It's a life I want to bring into the world. I'd be so beyond heartbroken I wouldn't know what to do with myself. I don't know what to say to him.. Any advice would be nice. No harsh comments please, only support.