Hi Nosh and welcome to our forum,
Just to say, don't give up, I know when I did my Prelim group one of my group didn't lose weight immediately (though most of us lost loads in the first couple of days) and it was because she was retaining water, which my Locum tells me happens to all us ladies from time to time. Anyway, she stuck with it and after 5 days lost an amazing amount, after that her progress was as good as any of us.
Don't turn to comfort eating, please, surely that is what brought you to the diet in the first place?
Anyway, hope to hear good news from you soon.
Lots of love,
Karen. xx