What am I doing wrong?

I've only been doing keto for a week, but my partner is down half a stone, yet I weigh exactly the same. We're stark contrast of each other atm, and it's confusing and frustraiting.

He is much healthier than me in terms of diet and exercise, I am much more overweight than he is. Could these be reasons? I also switched over from Slimming World, so no or low fat foods to high fat, high protein over night. Could this be doing something?

I am trying to weigh and measure everything I eat, I can't eat as big a portions for breakfast or lunch, and haven't lost a single pound...!

Does it take longer for women to see a change?

Edit: I downloaded Carb Manager to help me keep track and ither than one day when added up a few cheeses wrong for a recipe, I have been keeping with my Calories target.