My FIRST child NOT his

This is my very first pregnancy. I have been dreaming of this moment forever now but now that this moment has come, I am feeling more awkward and alone than ever. My baby father already has 2 very young children! It just feels like this is no big deal to him. I am baby crazy, cant stop thinking about the baby, talking about the baby, dreaming about the baby, everything in my mind is baby baby baby. He rarely ever brings the baby up, I try to carry on conversation about the baby like what names he likes or nursery decoration ideas, and barely responds. He tells me things like, theres still lots of time to think about all that stuff. It all just feels like its nothing to him, been there done that