I know someone who did it - without meetings or anything, just at home using their own "points" system - they worked out their points rate differently to normal - it was 2 or 3 extra per day to account for the additional calorie needs.
Other alternatives:
Skinny B!tch Bun in the Oven (if you're into their philosophy, which I am)
What to Eat When You're Expecting
Any number of other books on nutrition in pg.

So even if you dropped WW while pg, you could stick to one of these programs and be on a maintenance stage.