Hey Sona
It's a pain when all your efforts don't pay off but they will. Up your water intake, cut your dairy and exercise. Add in a PP day or two and I'm sure you'll get a loss (maybe not a massive one, but still).
I've deleted my sig now, but I always had a loss after a weekend meal with friends (not even remotely Dukan and probably worse than your food intake yesterday) even if it was only about 1/2 lb. The following days, I drank more, used less tolerated foods and tried to lower dairy and not eat crabsticks.
Step away from the scales too until your official WI day.
Good luck!