Having a hard time cleaning!

So i have found myself behind on the usual chores. And now i am overwhelmed. I normally keep a very clean and well maintained home. But now its become extremely hard to clean my house for more than 30 min without becoming nausous and exhuasted. And now i NEED to clean because the disaster is too much. I have two young boys to keep up with as well. So that doesnt help. Any advice on how to maintain a home while pregnant in the first trimester. With my boys i was never sick so this is all so new to me! Please help!