How quick should you start losing body fat during a diet/excercise regimen?

I have been working out for the last 5 weeks at my gym on a regimen of 2 days weight and 3 days cardio. I have lost no weight, but instead gained 4 pounds. However, my body fat has dropped from 31.6 down to 28.5 during this time. Is this healty to lose that fast and should I expect to see more loss if I keep it up?

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