Relationship Worries

I'm 9w and just don't feel like doing anything! This is my first pregnancy and I just feel all out of sorts, not like me at all. Morning sickness finally hit me last week like a ton of bricks. I'm either too sick, exhausted, or when I have good moments I'm trying to keep up with the chores. My SO says he's bored and keeps trying to get me to get out the house. Or he'll try to initiate sex. I'm just not feeling either of those things. Nothing against him but my head just isn't there. I told him this and he says he understands, but then he grows distant and I'm worried about the toll this will take on our relationship. Any advice??