Feeling a little Disconnected :(

I noticed that I been feeling really disconnect to my baby boy. When I first found out I was pregnant I was so excited & got more excited when I found out its going to be a boy. But now I just seem to not feel that excitement I felt before, it's scary because I don't want to feel this way. I haven't told my husband about how I been feeling but he has noticed that I just been really low lately. I don't if it's normal. I am planning to talk to my doctor about this in my next appointment. Have any of you ladies ever felt like this? This is our first baby & I want to feel that connection again.