She could drop the pups a couple of days either side of her due date, have plenty of newspapers available as they are easy to red up. You'll know when their on there way as she will become really restless not sittin at peace, burling round and round ripping up newspaper trying to make a nest for the pups, also she might be of her food and she may empty her bowels before the big event. When the first one is here there may be about 20 mins apart for the next, sometimes quicker and sometimes up to an hour , any longer may be cause for concern and if in doubt phone the vet for advice. Watch out f