How fast should I lose weight?

TimePhantom
So I have been trying to slim down recently and have been doing the following. I significantly changed my diet and have cut out almost all junk food, and now eat smaller portions. I have also been swimming laps at least once a day.

I have been doing this for about 3 weeks and haven't really noticed much change. I know it takes a while to lose weight but I need to see some sort of change to keep me motivated.

Also if anyone has any tips or things I could do different that would be great.
How fast should I lose weight?
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