It's not recommend to START a new, intense workout routine you're not familiar with while being pregnant, but there is absolutely NO reason not to work out! In fact, it's highly recommended to exercise while pregnant. Healthy, fit mom = healthier baby!
HEre's a list of great tips on how to do so while pregnant: www.babycenter.com/0_the-13-rules-of-safe-
It's actually a good idea to start now. Healthier mom = easier conception.