Ditto what blueflyer said. Pick yourself up, dust yourself off and get back on track again.
A more important question to address is what triggered your cheat? Something you might want to consider is whether or not some of the low carb "treats" you've added back in are triggering some cravings in you. If they are, it may be best to leave them out for now or risk having to repeat the "get back on track again" process over and over.
Just a thought....