Motivation!!! Help

Ok so I'm pregnant lol obviously. My fiancé works full time Monday-Friday and I stay at home. Now, that being said it's kinda my area of expertise to keep up with the house which is completely understandable. R (my fiancé) is NOT good at cleaning up after himself or in general at all, but it doesn't bother him. There could be dishes for a week and he literally wouldn't care. I've been so exhausted lately (I got bed by 8:30 pm 😂) just from creating a human so I have fallen behind. My bathroom is clean, but nothing else. I'm so tired and not my normal self that even when our puppy chews up like a paper towel or something I hate picking it all up. I really need to clean my kitchen and turn on the Roomba and mop but my lower back hurts and I just am so out of energy! I need serious motivation or help getting energy back!!!