mcheyenne is totally right. it varies per scale. and stick to your routine! dont make it a crazy un-sustainable change.. do something you could stick to forever. (make healthier choices.. skip the fries. etc)
personally. I go insane if I weight myself everyday. I start jumping on the scale every hour or so. I get depressed or happy depending on the number. It ends up dictating my life if I weight myself more than once a week (and it still is on my mind ALL THE TIME.. )
I think you should relax. stick to a healthy routine and the results will come. trust me!

dont resort to the unhealthy ways. ya deserve better!