should i trust the scale?

im almost 4 months out...and for the past couple of weeks according to the scale i have been dropping like 6-10 lbs a week. can we still drop weight like that farther out? i keep getting on and off the scale but it still says the same. i weigh 1 time a week. i guess i still cant believe it. im down 90 lbs(so says the scale) but i dont see it. so i dont believe it, think im going to go to the store and weigh myself on diff scales and see. people say they can see it. friday nite i went out with my best friend and when i went to her house i walked in and her BF followed me into the room, i waited a minute and turned around and said" are u checking out my a**?" he said" ohh ohh noo..i just couldnt believe it..u look like a totally different person" he then came up and gave me a hug and said how great it was. i was so shocked. well thanks for letting me type..lol.. i guess i need to start believing...hope u all have a great day!! tanya