You probably weighed yourself on your home scale first thing in the morning after going to the bathroom. When was your appointment ? Depending on when it was, you probably did eat some breakfast and drink some water. The physical weight of the food/water you ate is what caused the difference in the scale.
Try it some time. Weigh yourself first thing in the morning on your scale. Then eat your normal breakfast. Get back on the scale. Did you gain weight ? YES ! Did you gain fat ? nope. The food and water you drink have weight and if you were to weigh yourself multiple times during the day, you'd see how the scale goes up and down based on what you eat and how many times you go to the bathroom.
I always thought that doctor's scales were rigged.
Nah, it really isn't unsual to see a different number at the doctor's office. no worries !