I would feel neither guilty nor concerned assuming your a retail trader there may have been a reason (you will never know) your gtc was executed. If a mistake was made and it gets busted...so be it. You are under no obligation to bring notice to what you believe is a "mistake". I just wouldn't run out and spend the money but I certainly wouldn't feel guilty......nice trade
edit: oh...and GOD doesn't really care about your trades he's more worried about inflation:eek: