I thought WW has a healthy pregnancy "plan". Just about staying with eating healthy. I could be wrong though
No, WW is not safe for pregnancy (and even they admit it). When I am doing WW I am targeted to literally eat about 1,200 calories per day. That would be rough while pregnant, borderline dangerous I'm sure.
I'm sure you could somehow make their maintenance program work for pregnancy, with some allowances for the extra calories needed (not much, but some). But WW wouldn't take on that liability if they are smart. Women really shouldn't "diet" during pregnancy unless it is with the guidance of a nutritionist and OB. At least so far, WW has stayed away from healthy pregnancy diet management.