The eggs need to be kept around 99.5F (if they are still viable after cooling off for such a long period of time). It would help to know what your weather is like. If it was pretty mild while they weren't being sat on, they might be okay. If it was cold, their chances aren't going to be that great. If you've got a bright flashlight, scoop them up, take them somewhere fairly dark and shine the light into the fat end of the egg. If you see movement inside, they're still alive (though they could be even if you don't see movement).
If I were you, I'd run out to the store and pick up a cheap incubator or make one yourself real quick and let them finish off. I don't think the heating pad is going to work, they have a tendency to get quite hot. And, as the eggs near hatch time, they'll need humidity to keep the chicks from getting shrink wrapped in the shells. You'll also need to turn them 3 times a day to keep the embryos from sticking to one side of the shell or the other. If you decide to try to incubate them, there are lots of great threads in this section to help you get started, if you haven't already read through them.
Good luck!
