123 calories left

And even if your deficit is smaller . . . just eat something sensible, log what you eat, learn from today, and go on. It's a drop of water in the ocean, really.

Put it in perspective.
Have a dinner that is approx 473 calories and relax. This meal will reduce your weekly calorie deficit by 350 calories or 1/20th of a pound.

You don't have to be perfect all the time. Just pretty good, most of the time.