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This is MUCH too old for her to be having puppies. No ethical breeder would let her go through with a pregnancy at this age.
Since you caught them before they hooked up, there is a chance that she is not pregnant.
You still have some options. You can discuss them with your vet. Your vet might recommend that you spay her right away, abort the puppies and prevent future litters.
Let me know if you still have questions.
If she still has heat cycles, she can probably still get pregnant. Usually by this age, the dog has stopped having heat cycles.
If they did hook up, there is a chance that she is pregnant, yes.