Sad mama

Let me just say, I'm very excited to be having my first baby. I'm only 5w3d but I love him/her already. However, I've been really sad because I feel like I don't have the full support of my SO. He claims he's happy but he doesn't act like it. He doesn't ask me how I feeling or talk about the baby if I don't bring him/her up. Even when I do, it's almost like he doesn't want to talk about it. Before we got pregnant, he claimed he wanted a baby. We didn't plan this & now that it's happened, he seems like he's changed his mind. Idk.. It just makes me sad. Prayers are greatly appreciated. Can anyone relate or have any advice?