I know you didn't mean to take the kittens away as soon as t hey were born, but if you contact a rescue NOW, they MIGHT be willing to foot the bill for Oreo's prenantal care and the first vet visits once born, etc. Then once they are old enough for adoption, you'll have to help them frind homes.
Also, if you call a rescue now, they might be able to make room for them and plan on them, opposed you just calling one day when they are ten weeks old franctically trrying to find a place to send them.