I took small wrist weights that weighed about 1lbs each and put into the pockets of my heavy baggy jeans with a really tight belt so they wouldnt fall off. They dont make noise like change or fish weights. You could wear boot or flare cut jeans that are a little long (that cover ur ankles even when you sit down) (you hadnt had time to get them taken up if they ask), and put some ankle weights on that are about 2 lbs each, if you can handle it. Take an extra bag with you, and after weighing, tell them you need to use the bathroom so you can take them off. This works best if someone goes with you so you can pass the bag off to them and they can carry it. Just dont use 5lbs - 10 lbs weights, it will make you look bad next time around, plus the doctor might know something is up.
Also before you go, weigh on a bathroom scale with different jeans and shirt combos. Write it down, and what ever weighs the most, wear it that day. Just dont include shoes.
Just a note, I have actually done the first one I suggested (wrist weights in pocket). It worked. I have only thought about the second plan, but have not tried it. Hope my doctor dont see this...lol.