Metformin did not work for me for weight loss, but I am taking it to prevent diabetes and possibly for longevity.

You definitely would not see weight loss on it within two weeks, even if it ultimately helps you lose weight, which is not that likely.

It is a very fashionable drug these days as it is believed to convey longevity benefits on non-diabetics (which is debatable), but given your young age, this does not seem to be an area of interest for you yet.