My husband?s brother (M35), who is currently living with us, is extremely obese and recently stopped going to the bathroom. I (F26) am losing my mind and my husband (M27) won't stick up for me.

I will refer to my husband?s brother as ?John? in this post.
Please ignore any grammar mistakes. English is not my first language.
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Some background information on John:
? He is adopted. He was living with his birth parents until he was 8 years old. My husband?s family adopted him when he was 11.
? As a child, his parents neglected him which is most likely the reason for his severe obesity (I?m talking about almost 600 lbs here.)
? John has a tendency for very aggressive behaviour.
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The only reason why John is currently living with us is because he?s not able to live on his own anymore. He basically needs someone who takes care of him 24/7 or runs errands for him but he?s not willing to pay for a caretaker. A few weeks ago, John had to move out of his apartment. My husband and I agreed to let John stay at our house for 2 weeks so he could figure out his situation but he?s been here for 6 weeks now. During those 6 weeks he has been aggressive towards both me and my husband.
There are several issues with John staying at our house. First of all; John recently stopped going to the bathroom. That means no showering, peeing in bottles and I?ll spare you the rest. The smell in John?s room is absolutely disgusting. It?s literally vomit-inducing. The second issue is; John?s room is actually supposed to be a nursery because I?m 4 months pregnant, which means that John can?t stay there forever.
My husband is afraid to kick John out because ?Where will John go?? and ?How is he supposed to live on his own??. I don?t care. He needs to get out, but it?s nearly impossible. I?ve told John multiple times that he needs to leave but he refuses every time and it?s not like I can just drag him out.
Right now I need my husband to stick up for me. I need him to set his priorities straight because in this moment it seems like his brother is more important than me. He?s worrying more about John than about me or our child. Whenever I tell my husband that John needs to leave, he just walks away or simply ignores me. I?ve started to seriously think about leaving my husband, which probably sounds insane. But I can?t be married to a guy who prioritizes his brother?s wellbeing over his (pregnant) wife?s wellbeing.
How should I handle this situation? Or how should I tell my husband that he needs to set his priorities straight? Please, if anyone has any advice I would be extremely grateful.
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TL;DR: My husband?s brother is staying with us because he had to move out of his own apartment and can?t take care of himself anymore. He?s extremely obese (~600 lbs) and recently stopped going to the bathroom. My husband is afraid to kick his brother out and basically chose his brother above me.


Source.