Working until due date?

I'm thinking of dropping down to part time the month before my due date and possibly cutting down to 4 days instead of 5 at the office now until the last month when I drop to part time. My work would be okay with it and my husband and I arent broke but its always nice to have the extra money and I feel like I should keep working as much as I can so we can keep putting my pay into savings. But I'm so so tired and just useless when I get home and weekends just arent enough time. Idk what to do. Just looking for tips, advice, words of encouragement, or what your plans are?