Help! My husband isn't happy with the news.

While we were dating my now husband and I always talked about having kids. When we got married I wanted to start trying immediately but he said he wasn't ready yet. Fast forward almost two years I told him if we didn't start trying I was thinking about taking some space for a while. He know a family was really important to me and I assured him he would still have time to get used to the idea because it would likely take months to conceive. Well I was wrong and we got pregnant on the first try. When I told him the news he said he didn't really know if he ever wanted kids. I don't know what to do.  I feel like I can't be happy because he isn't. What should I do? Will he ever come around? Help!