Help me

So I'm 20 weeks pregnant with a little boy. My hormones have made it to where I don't want to be touched. Even my husband except for about once a week. We have custody of my step son and I'm learning how to be a parent to a 6 year old while pregnant with my first. He's very affectionate and I'm the furthest thing from it right now. I told like anybody touching me, much less hugging and stuff like that. My SO thinks I'm just being mean but I really can't help it. What do I do?