Open it and have a look. If it smells funny or something, then best not to. But otherwise it will probably be fine. Just make sure you heat it properly, and try a bit first. If it tastes funny when you eat it, leave it. But one day is hardly anything, so I wouldn't worry about it. If it was a week or something, that's different, but a day, you should be fine. Use your common sense when looking at it.