Brianna--There are a couple of things you can do for your kitty at this point.
First-make sure she has plenty of good food and fresh water to drink. She'll need it to feed her babies both now and after they are born.
Secondly-start looking for families for these babies. Make sure that they are kind people who will take good care of the babies and get them spayed/neutered as soon as they are old enough.
Third-make an appointment with your vet to have your kitty spayed a few weeks after the babies are born. This will keep your kitty from having anymore babies; there are too many unwanted kitties out there as it is to be adding more. Tell the vet that your kitty is pregnant and they will tell you how soon after the babies are born she can be spayed.