Hi and welcome. i swapped from CD to SW and am following red/Original days only at the moment (will chuck in a couple of greens on the days I'm seeing a personal trainer) in 10 days time. I lost 3lbs in my first week but that wasn't going straight from CD to SW. I was off any diet for about 4/5 months and gained around 12lbs after CD mostly at Christmas then on holiday in Canada straight after.
I was amazed at 3lbs given how much food I could eat compared to nothing on CD!!!!!
Good luck!
x