In short, yes, it can appear to happen in certain circumstances
Here's a few:
Assuming say my weight of nearly 200 lb, it's possible for a number of factors to contribute to extremes in each direction.
1) Water content of your body:
In the morning many people are typically less well hydrated/dehydrated after a night without water. It is possible to lose 1-2 % (2-4 lbs) of your weight the previous evening.
Or, vice versa, to gain water weight during the day after having been much lighter due to dehydration in the morning.
2) Other factors can increase this dehydration effect and make the morning weight appear less, including exercise, sweating, fever, and especially and in particular, alcohol. (Alcohol can very dramatically increase dehydration for some people, and not in a pleasant way. I'll admit I've had some experience, and have a body composition scale to document it.)
3) Other things that can increase dehydration effect are diuretics, both natural and medical, for example blood pressure medications. (If I forget to take mine I will be looking at a gain of a few of lbs of water in a day or two.)
4) Also if your minimum weight was after a visit to the "loo", then that can account for an additional variation, which can be more or less marked depending on the day, without getting into details. (For some or maybe most people, it's not always the same variation each day, by any means.)
Good luck and keep it going. You've lost a around 3 inches of the waist already, right, which is great going. Whether you temporarily have a little more water on board or not, no matter, I'm sure everyone you know has noticed the weight you've lost and that you're starting to look like a new you. If not, they will soon.
Main thing is to stick with your plan that has gotten you the better measurements.
, then 2.5% of that is
