Not excited anymore?

So I thought after I got my ultrasound the fact that I was actually having a baby would sink in and I would be extra excited. It seems to be the complete opposite! It's like I got my ultrasound and now it feels like it's over. I keep forgetting I actually have a son in there. I don't even feel excited about it anymore. I want to, but I can't bring myself to even look for or research baby stuff. I'm so afraid he is going to be born and I won't have a connection to him or I won't love him like I should and that terrifies me. Does anyone have experience with this and have any advice on how to deal?