Weight Gain and Half Marathon Training

Completely ridiculous I know. I gained two pounds over the weekend and haven't gotten it off yet. I know it's only Tuesday but I seriously feel like I am working all the time!!!! I have read a few articles about weight gain and training and muscle mass and gorging after runs. Using My Fitness Pal has helped a lot with identifying my nutrition goals. My current allowance is 1300 without exercise and then I usually burn 800 or a so a day with my Fit Bit and then a workout on top of it. I think this week I'm going to try to lock down at 1500 calories a day regardless of exercise and see if that will make a difference... so tired of feeling fat!