Hey Jude (reminds me of a song…….;-) ) Think of yourself as doing well, but I feel your pain. I am also on week 3, day 1, and lost a similar amount to you (3.6kg) in the first week – how chuffed was I???. But my weigh in yesterday showed a loss of absolutely zilch, nothing at all since the previous Monday 🙁 No reduction showing on the tape measure so far either 🙁 though I only measured my waist to before starting, so there could conceivably be a reduction in other areas.
I too have followed BSD800 religiously and with NO wine (well, one small 125ml glass of white last Thursday, but it was a celebration, and I allowed for it in my daily carb / calorie allowance) and, in fact, most days my carbs have been only about 25g – but still lost nothing last week 🙁 It is easy to become discouraged, I know, but there is so much support on this site which is carrying me through this early plateau – as others have said, this is not a magic, instant fix and, personally, I would have been DELIGHTED to have seen my scales register a loss of 1kg yesterday!
All I can say is to keep on keeping on – on 800 calories a day we cannot fail to lose weight eventually. 🙂 Good luck for the coming week – I shall be interested to compare notes this time next week.
PS I’m going away for 10 days next weekend, so week 4 will really be a challenge – won’t have any scales available either, so will just have to stick to the plan as best I can 🙁