Candle them again. Look for movement, veins lining the very top of the egg, etc. But be very careful; you never know if they could be internally pipping and you'll disorient them if you're too rough. That's really all you can do, aside from waiting. If you have a good flashlight, you should still be able to see some veins, but then, I found my african eggs were the hardest to candle. Even when I hatched pilgrim and african eggs together, they all hatched on day 30, but your milage may vary depending on your incubation temperatures.