As long as you weigh yourself consistently on one scale... I think you should stick with the number that showed up.
Different scales are inevitably going to show different numbers, so unless you plan on only weighing yourself on the doctors scale.... then use your at home one.
If you're really worried about the reliability of your scale; step on it, then take something that you know the weight of for sure... like a couple of 2 lb dumbells or something, and stand on it again and see if it shows the correct gain.
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