Resentful when husband leaves - stuck with newborn

I’m caring for my first baby. He’s a few weeks old. My husband is supporting the fam while I care for our baby but I’m still resentful when he gets to leave the house for a few hours, take a shower or gets to be inside his office. He leaves the house to get our new home ready for us but I’m still so resentful that I’m stuck at home with a newborn and no time to even shower. My baby is non stop work around the clock and I can’t shower or even brush my teeth! My husband leaves the house happy and well rested. I know this is my job now as a mom but I’m resenting him right now. I wish he could help more but that wouldn’t be fair because hes working and getting our house ready