Is there such a thing as a cat birth control pill?

Dear Most Esteemed and Knowledgeable Kitties: I have a big problem. I have two adorable kittens approximately 5 months old. They were diagnosed with feline leukemia when we took them to their first check-up. The vet says they will not survive their shots or spaying. We have brought them up since they were about three weeks old because their mother disappeared one night. Being that they are 5 months old I’m worried that the female will get pregnant from her brother. Is there any type of feline birth control pill or shot we can give to both the female and male? We love these kittens and have gone through so much with them. Thanks, ~Annette

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