This really depends on your current financial situation, where you live, and what kind of job you have. If you live in a country that requires paid maternity leave, you should definitely take the break - you don't want to overwork or stress yourself during pregnancy, since studies have shown that it can cause an miscarraige. However, if you live in places without paid leave (for example, the United States) then you should still work, but try and take breaks, especially if your work requires a lot of strenuous activity. Standing on your feet for too long can disrupt the bloodflow to your baby and it's downright dangerous for it. Don't listen to people who say you should "exercise" or "work out" before a pregnancy - it could be DANGEROUS. Finally, don't do any heavy lifting late into your pregnancy. However, if you have a desk job, you should be completely fine.