I've done that before and just used it as a bit of an excuse for a pig out! Tested lots more frequently to check I still had enough carbs in my system/hadn't overdone it with the carbs (which is easily done as SAH may have found!). But - the solution is to eat carbs so it's not too much of a punishment if you see what i mean.
I didn't realise til I went to a country house for the day, and had a hypo in the shop, I'd thought I might have injected twice that morning but couldn't remember. Luckily the tea room was upstairs with a lovely selection of cakes, so once I'd had my glucose and just needed to put some longer acting carbs in the systemn, I was definitely in the right place!