Worried

I am a little worried today about my weight loss this week. To be totally honest I cannot believe how much weight I have lost in 3 weeks I feel like it some kind of trick or I am dreaming or something. I am I know I only lost 12 lbs but in 3 weeks I feel is GREAT for me. Granted I have been working hard and actually doing the plan but sometimes I can't even believe that this is considered a "diet". Once you start making recipes you are amazed how good the food taste and I cook more which also amazes me because I never thought I had the time in my schedule before. I am worried that I won't lose any weight this week because of the "this is too good to be true" ideaology that is floating around in my head. My husband requested chicken and dumplings the other day and I had some for dinner and I am worried that I overindulged and now I feel like I have to work out to get rid of the extra calories. I have to put another day into my work out schedule so that I will feel better about my decision.
Thus far this week:
Mon- cardio
Tues- ST with trainer
Weds- OFF (weigh in day)
Thurs- ST w/ PT
Fri- I have to work some cardio in
Sat- ST with PT

I plan to hit the gym today with my trainer to do some cardio. I got to burn off the extra calories. My goal for this week in 4 lbs for a total of 16 lbs in 4 weeks and this will take me out of the 3's and put me back in the 2's! I will be happy with 3lbs but ecstatic with 4lbs. I have my last exam today so I got to go cram. LOL