just having a sook about my SO

I thought my SO would be lovely through pregnancy but he has done barely anything for me to make it easier! I'm 11 weeks and I've already been on bed rest twice with bleeding and pain. I also have part time care of my niece and nephew on the days I have them he barely even gets off his ass or talks to them. (He wasn't like this before) he has been with me since before they both came into my care which used to be full time. I don't understand what his thinking or feeling just that his not thinking about me. He doesn't do a thing for me unless I ask and when I do he moans about it. I want him to embrace this pregnancy because it's my first and last but I just feel like he doesn't want to acknowledge it at all. Ladies how do I talk to him about this? I'm feeling so alone