This is highly unlikely, and here’s why. The nits need your body heat (like an incubator) to help them hatch. That’s why the nits are usually laid close to your scalp. So if a strand of hair with a nit on it falls off your head, that nit will most likely not survive. And even if it happened to land on a warm surface and did hatch, the nymph (newborn bug) would need to get onto a human head really quickly to feed or it will die. So the likelihood of all those conditions lining up perfectly for that nit to survive is one in a million.