Out of love

My SO and I have been together for over 3 years now. And I'm currently 22wks4days pregnant but everything seems so different between us now.. We just don't seem to be in love like we used anymore.. I feel weird around him.. Like I can't open up to him anymore.. Tell him things I want to because I'm going through depression right now.. But it never seems like the right time to ever say anything to him anymore because he's so busy...