Unexpected Result

As its Thursday  today was a cardio day. I figured I'd do a quick weigh in before hand and low and behold I have gained a pound. I have been working so hard this week to meet my calorie goal, getting my workouts in, etc. I really though I would be down another pound atleast not up a pound. It's perplexing and a bit discouraging. 
Oh the plus side I did 40 minutes on the treadmill and got up to an incline of 9% for a few minutes. I made fajitas for dinner and found a healthy alternative to sour cream. Nonfat greek yogurt tastes delicious on a fajita.