First off, congratulations on your pregnancy
I was told a while ago that WW used to allow pregnant women to stay OP and keep going to meetings. Then a woman who was pregnant miscarried and sued the company. This is what one of my leaders told me, I'm not sure if it is true or not. But really, you should not be restricting your caloric intake without your OB/GYN's advice.
Once a WW becomes pregnant, they are supposed to notify their leader. They will not be allowed to go to WW meetings anymore or weigh in, but their "account" gets put on hold until a certain time after giving birth (I think its 8-10 weeks or something) so they can go back to WW without having to pay any missed fees, etc. At least this is how it works for a Lifetime member (I asked for my own knowledge a while back because DH and I will be TTC soon).