Beware of the Tricky Scale

As a trainer, I deal with people who are concerned about their weight everyday. My advise is to focus more on their body fat percentage which is a more accurate indicator of their health and fitness level. Let me go a bit in details with that. Maybe you've heard of people who've lost weight, but still have unwanted layers of fat or they are flabby. This is because they have a very small amount of muscle and high body fat, it's what we call skinny fat.
Muscle tissues are more dense than fat, which means muscle takes up less space. So a person with low body fat percentage can be thin and fit but still weigh more than a "skinny fat" person.
For this reason, the traditional body mass index (BMI) by it self is not enough to determine our health and fitness level, because the formula only takes into account a person's body mass and height but not their body composition.
To get an accurate picture of your body fat, I recommend visiting a specialist who will use a skinfolds caliper, or an electrical impedance machine to assess your body composition.