When to leave work?

I'm almost 34 weeks. I work at a collision shop, mostly in sitting at my desk or writing estimates. Lately I've been so extremely exhausted and out of it I can't focus and even fall asleep at my desk. I'm not coming back to work after I have my baby so I'm trying to decide when to leave. I would like to have some time to get things ready and clean and just relax. I just don't want to leave to early and regret not getting those paychecks but then I don't want to regret not leaving and getting some me time and cleaning. Weekends I'm literally sleeping all the time and have no energy or motivation for anything. I'm thinking maybe leaving at 37 weeks.. everyone keeps telling me she will come early.