Im not sure on lipotrim but i know from weight watchers that peoples bodies deal with the totm differently and losts of people didnt have big losses before it but had big losses when they were actually on it or the week after. Everybody is different so maybe this is a factor and you'll probably get a great big loss to make up for it.
Also are you drinking enough water and spread throughout the day??
And lastly it could be the circumstance of your weigh in, did u weigh in later in the day today? Were u wearing differant clothes/shoes/jewellery? Had you drank more water before this weeks weigh in? Or were you and your clothes wet from all the rain? Because damp clothes weigh a lot more.
Hopefully something here has rung a bell and can explain it, but even if it doesnt dont worry, if you are doing everything 100% then there is nothing more you can do and dont worry the weight WILL come off you one way or the other!! Also look at it this way at least thats two pounds that are gone forever!!! Hold two pounds of butter in your hand- its actually quite heavy and you are not carrying that anymore so well done!!!! X