When a person goes low carb they lose 2-5lbs in the first week or two. This is the glucose stores in your liver and muscles. this should not be considered as "weight loss" because when a person reintroduces carbs into their diet the glucose stores are restored.
I was low carb off and on for a few years. I learned that my glucose stores led to a three pound loss in week one and a three pound gain when I increased by carb intake. It also took me a few weeks to stabilize before I could lose weight on another type of plan that included more carbs.
Hang in there and follow the plan that makes you feel good.
Jen