I have lost 5lbs in one day (I'm 15) is this normal??

Okay so I am 15 and I weighed myself 24 hours ago and I weighed 8,6 and I checked 3 times!! I stood back on the scales today 3 times just to be sure and it said 8,1 each time!!! Okay so I haven't pooped in 24 hours and i know that you can change like 1lb in a day but why have I lost so much weight in a day!! I'm worried I guess! I went for a run and I ate a little less than normal but nothing too serious!!🤔😶

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