All pet cats should be spayed or neutered, for their own health and safety as well as to help reduce the overpopulation crisis we are currently in with more cats and kittens suffering on the streets or being euthanized in shelters than rescues are able to keep up with. 
At Tiny Kitten Coven, we adopt all of our cats out already spayed/neutered. 
For help getting your own kitty spayed or neutered, the following organizations may be able to help.

Resources

What To Do When You Find Young Kittens

Never, ever take kittens away from mom while they are still nursing! For neonatal kittens, their best chance is always with a mama cat. If you find young kittens that are otherwise healthy, unless you absolutely know that the mom has left the area for good, or is severely injured or ill, leave them be and wait for mom to come back. This can take several hours. 

If you find a young kitten alone that is not in obvious distress, mom may be in the process of moving the litter or otherwise planning to return. Do not stay too close, as this may discourage mom from returning. Give the kitten/area at least 30 feet of space and watch quietly, or set up a camera if possible to watch for mom to come back. If she does not come back within 6-8 hours, or if the location is otherwise dangerous, you may move the kittens.

If mama cat is friendly, move her and her kittens indoors where they are safe from predators and in a climate controlled space. A dog crate in a small corner will be sufficient as long as there is enough room for the mom to have a nest to nurse the kittens, food & water, and a litter box. If the mom is feral this is also possible, but you will need a trap to catch mom and to be aware that feral cats will not act like tame cats or likely ever be happy indoors. Once the kittens are weaned, feral moms should be spayed through a TNR program and released back to where they came from.

Never trap a cat without a plan. If you find a pregnant cat (friendly or feral) or are working to help a colony that contains pregnant cats, contact a local TNR or community cat program for priority spay, and then make sure all other cats in the community are fixed too. 

If you find a young kitten that has definitely been abandoned or you know that the mom is ill or injured, DO NOT give kittens cows’ milk! They cannot digest it. Kittens need formula designed to replace their mom’s milk. They will also need to be kept warm, stimulated to potty, and fed up to every 2 hours. How to feed young kittens.