Weigh In. But...
Don't weigh yourself too frequently
Your body takes time to process fuel (food) by making chemical conversions. Believe it or not, cream filled Twinkies DO NOT go directly to your hips. It takes a little time for you body to break these down and THEN deposit most of the energy in fat cells. Also when you expend energy it takes some time for your body to convert fat cells into usable energy. So don't get on and off the scale six times a day. It is normal for your weight to vary throughout the day. With too frequent weigh ins, a good number will give you false hope, and a bad number will make you terribly depressed.
Choose a time of day for ONE daily weigh in. Many people find first thing in the morning the best time. This will probably give you the most consistent and accurate measurement. Weigh-in during the day or evening can be easily distorted by meals or drinks. As an experiment, get on your scale and after a moment pick up a 16 ounce bottle of water. You should see your weight go up a pound. Causing you to lose water is where some fad diets and quick loss programs can deceive you. So, do not dispair the fluctuations. Pick a consistent time of day for your weigh in and over time it should provide an accurate record.