Living with MIL rant.

So I've lived with my mother in law before and she owns the whole property.. His grandma lives in another trailer on the property. 
Now in my house, when my mother needed something done, she asked us to do it and we would do it. Simple as that. That's what I'm used to. So when I came to live here, that's what I expected. If my MIL needed me to do something, I would do it if she asked me to. But she never did. So I would relax.
Well I then hear from my fiancé that his mom tells everyone that I'm lazy. Including his grandma and his aunt. And I was compared to someone else in their family that just sits around and does nothing. Apparently, I'm one of those people who just lets the man do everything.
By like I said, that's not who I am. So after that, we ended up going back to live with my mother cause I just felt uncomfortable here knowing I was being talked about behind my back.
Now we're back here with my MIL because I'm pregnant and due to other problems with my mother. Well now that I'm pregnant, I feel like I'm pushing myself to do so much every day around the house while everyone else is at work. But this time it's my fiancé calling me lazy and saying I don't do anything. That he's the one who has to do everything.
It gets so hot in this house cause my MIL wants to save electricity and not use the air conditioners as much. I get sick from it being so hot. And I just feel like I'm pushing myself to do too much. I'm not a lazy person and I do things when they need to be done.. But since I'm pregnant I also always rest when I feel I need to. I just feel so guilty even when I cleaned the whole house and pushed myself over the limit. I just hate feeling like this.😔 sorry I just had to rant...