How are you supposed to know?

Ok so this may sound a little childish because that's kind of how I am feeling about this. I was out yesterday with a good friend of mine, in the past we were never in a relationship but I did end up getting Pregnant by him. unfortunately I had a miscarriage which broke my heart but I do still have a friendship with him. We do not talk about what happened much and I often wonder if I did have the baby would we still be close friends? Now he has other children and one of his children happens to be with a mutual friend of ours, I hang out with her and her child pretty often but yesterday I went with him to visit his child and it was such a nice thing to be able to see him have time with his child but at the same time I was pretty upset I wanted to see him with our child and wonder what kind of situation we would be in. I think it was great he was able to spend time with his child but I couldn't help but be jealous. Am I completely wrong for that?