Pregnant and boyfriends son will not clean litter box

I just hit 20 weeks pregnant. Last month I got a kitten as a companion because my boyfriend is always gone. He's a truck driver. His 19 year old son also lives with us. I have asked his 19 year old to please clean the litter box for me because it's dangerous for me to do it and he said no. He is a germaphobe and has OCD that he's working on in therapy so I understand. But at the same time it's physically dangerous for me to clean the litter box. I asked my boyfriend to talk to him and explain the dangers of a pregnant woman cleaning a litter box but he said i should not have gotten the cat while pregnant. I told him he's gone all the time. His son and I don't really talk much. I've been lonely and wanted a companion. He said he's gone working for us and he can't make his son do it and told me to check back in when he farther along in therapy working through his OCD and germaphobia. How does that help me now? I have a cat and a dirty litter box. I don't want to potentially hurt my baby.