How...

Am

How do you explain to your SO that you are uncomfortable and just not feeling yourself?? We have lived together for now 2 weeks. (sounds weird I know but bare with me). We've been together 6.5 years. First time ever living with him and I am 8 weeks 5 days pregnant. How do I get him to understand i don't want sex that I'm uncomfortable and I'm just moody and that I'm NOT mad at him. He tries to understand but he just...doesn't... How .