A week is not sufficient time to know if a diet is working. Bodies are often resistant to short term calorie intake fluctuations and it takes some people a little while for the weight to start coming off. You shouldn't be dieting to lose any faster than 1-2 lbs a week and your weight can fluctuate that much just from differences in what you ate or drank recently, sodium intake, and time of the month (if that applies to you). So it really takes a few weeks or more to know if you're losing weight.
Stkitt said, "I know people on the med that eat healthy and exercise and the weight just won't come off."
On that note, I've also known a lot of people who are not, and never were, on meds and have a hard time losing weight even when eating healthy and exercising. And some people just do not lose weight on certain types of diets. Even before I started meds I could not lose weight on a low fat "well balanced" diet, counting calories all day. I had much better success losing weight with a lower carb diet instead, like the South Beach diet.
You also have to be sure you are not being too strict. If you cut calories too much your body will resist weight loss. Also consider whether you might have an underlying health issue that affects weight loss, such as low thyroid, insulin resistance, or hormonal imbalances.
I think it's too soon for you to blame the meds. If you don't lose anything at the end of a month then maybe try a different kind of diet like a low carb one.