not at all. I put on a lot of weight after having my last child - I put on just over four stone and i have lost about three and a half stone in 16 months.
being so close to my target, it has slowed down but i only need to lose a bit now so not too worried. Quite a few of my friends are doing herbalife or cambridge which although is hard to stick with at the start becomes easier after a while. i used slimming world online and it was great for me. I have a crunch fetish (or at least i did!) I am more into soups now. they are great for slimming cos you get all your vits and its not a lot of effort to eat.
My mates and I (on my mummy forum) do a challenge every week. one week it might be to run up and down teh stairs three times each way (often carrying baby etc) or a whole twenty mins on wii fit hula or somthing. they keep us motivated and fit in great with teh diet as it helps us tone up but doens'y have to be too prescriptive.
good luck. happy to stay here for support.