I feel the same way & extremely emtional
I felt extremely needy too, lonely and like I never got attention. But one day it just hit me that we were fine and nothing had changed, I was just being a girl. My fiance handled my neediness better whenever I approached it like "Honey, you know I'm pregnant. And I'm really emotional so I feel like I need extra lovings." He was fine with that. Just try not to be too hard on him approach TELL HIM what you want and need, because this is a huge change for him too and he probably doesn't understand the emotions.
I know how you feel. I felt the same way. I worked 12 hour shifts at night (6-6). When I get home I'd sleep. He'd work from 8-5. We only saw each other for an hour.