I am not sure if you can do WW when you are pregnant. I found this on their website declaimer section:
:
The Website is not intended for use by children, pregnant women, or individuals with any type of health condition. Such individuals are specifically warned to seek professional medical advice prior to initiating any form of weight loss effort or regimen.
But you could check anyway. :):
For example, pregnant women, and individuals under the age of 18 may not subscribe to our Fee-Based Products,

