Questions about weight variation

I've been eating in a low-carb style for a couple of months now and I was losing weight slowly but regularly. Three weeks ago I decided to join a Gym and lift and did so for the past three weeks, 4 times a week plus 3 times a week of cardio.
The first two weeks I saw even better results regarding weight loss and body fat percentage (I use one of those step-on scales). That with the fact that I was taking 1 scoop of whey protein after my training.

This week (the third) I started taking creatine (10g for loading) and a second scoop of whey (since I wasn't reaching the 1gr per lb), my diet remained the same but I am trying to progressively lift more weight and the results were that I gain 1lb and saw an increase in body fat, from 19.9 to 20.1.

Could that be related to the creatine? I'm asking because one of the side-effects is water retention and maybe that affects the scale as well.

Thanks

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