Sooooo DISAPPOINTED!!!

I AM FURIOUS!!!! I worked out every day this week, diet was great and what happens?? I GAINED A POUND!!!!!!! Soooooooo upset! Granted, I have my period, but still!!!! This is really interfering with my plans! I am really speechless and what does this one Pound gain inspire me to do? You guess it, I ATE 3 chocolate chip cookies!!! Now I am even more pissed at myself! I did go to the gym and did an hour class that hopefully will help and I plan on going 4 more days this week, so we shall see what happens next week...I really cant express in words how pissed I am at this point! thanks for reading....