Am I overreacting?

My boyfriends mom just found out she has the corona virus and my boyfriend has been over there IN HER HOUSE to drop food off for the past two days. He's been wearing a mask around her and washes his hands but I'm still not comfortable with that. His little brothers stay with his mom, she's not at home but she wants him to get them to come stay with us. I told him absolutely not, they've already been exposed to it. I'm also pregnant so I'm not trying to risk catching it. He got so mad and said i'm overreacting when I just really don't want to get me, him nor our unborn sick. Do you think I overreacted?

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