Food tends to keep longer than people think it does. As long as it doesn't look, smell, or taste odd, it is most likely fine.
My rule for food is I usually use it within five days of when it was cooked, or I toss it. I make exceptions if I'm starving, and the food in question appears totally fine. I've never gotten sick yet.
Of course, I may just have an iron stomach, so I would just use your best judgement. Thankfully, God gifted us with all the senses we need in order to figure out if our food is edible.