Working Moms

I feel like a slacker! My LO is 10 weeks old, and I just finished up week two of being back to work. At what point were you able to have the energy to come home, either evenings or weekends, and clean the house and take care of the baby? I just do not have the energy or time to do it. It is not as if I get home late or work weekends. We have not had a free weekend since Christmas, so that explains that. But I am home just after 4 every evening! I should be able to do something right?  My husband cooks thankfully! Anyone else going through this?! I am just so tired!