With only around four weeks to go, now is the time to make sure you have all your partner's contact details and know exactly how to get hold of him in case you go into labor when he's at work. He might want to be extra careful to ensure he has his cell phone switched on and at hand in these final few weeks, and that he's not traveling too far away.
If you have other children or other dependants (pets, for example, a dog) then you should arrange what will happen to them when you go into the hospital. You may want to explain to any older children what is going to happen so that they are prepared for when they go to stay with Grandma, or whoever will be taking care of them. If you're having a cesarean, you might also want your older children taken care of once you're home from hospital.
Reassure your children that you will be coming back and that you're not sick, but that you have to go to the hospital when the baby comes. Depending on the age of your children, you could go with them to buy a present for the baby or you could give them a special job such as opening all the new gifts. Presents from the newborn to her elder siblings is also a good gesture.