if you have come from a VLCD that can cause a shift in your metabolism, and this can cause a gain in your first 2/3 weeks, once your body understands it is going to be fine, have normal food again it will stop your body storing the fat, and you will start to lose weight again.
Maybe post your food diary on here (there is a seperate section for this) and we can all have a look and give you any pointers if you need them!
xxx Good luck, i can imagine you are feeling bemused and upset - but stick with SW! its the best!!! xxx