😳😢 why do husbands act this way ???

Sara • Clinical psychology major for adolescents and youth I have two children working on the third. In my late twenties
So I am six months pregnant and I don't like asking for help but being pregnant has made me have to ask because I'm also disabled   Last Sunday my husband didn't want to take out the dog and it hurts for me to do it if I have been standing too long already. Well the dog ended up going on the floor.   Today same thing but I ended up insisting he take her out.  He was a complete asshole about it.  Saying she just wants to go to the dog park (we take her every Sunday).  And then came in the house and told me told you so she didn't do anything....    And so I asked him why he was being so mean towards me all the sudden and that's when he stuck a knife in my chest saying he's mad that I act like I'm always right and everyone has to fall in line or I get mad.   I didn't want the possibility of me having to clean more coming about that's all it was. I even told him it's better safe then sorry.  Now he is avoiding me while I do all the chores with 3 herniated disks and fibromyalgia and swelling and inflammation in my joints.  😡😢😔.   Did I do something wrong ?