Munch a bunch. Don't skip meals or snacks. Keep a supply of nutritious foods at your work station. If you sit on the job, make sure you have a chair with armrests and proper back support. Take it easy at home.
Many pregnant women hold two jobs, the one at work and the one at home.
Make your own decisions. Just because your best friend decided to work until she went into labor is no reason you must do the same. Each woman is a unique person with distinct capabilities and needs. When it comes to whether you're going to work full term or not, there are no rules but your own.