You most definitely wont gain you mad woman *HUGS* WS is a recognised Exante plan, youre only having 1000 cals a day still waaaaay under your requirements. I think they say about 10lbs a month on it x
If you look in your boxes of packs they usually send 2 little booklets - one of these has info on how to do WS and how to step up the programmes - good luck x