treating a gravid or breeding animal with meds or pesticides may certainly interrupt the cycle, or cause enough stress for them to fail or throw bad eggs, but there really isn't a good alternative.
if you let the mites go on, they will cause more stress and grief on their own, and soon you will not only have no breeding, but perhaps no snakes at all. mites multiply exponentailly, you will have a lot more than "a few" within a few weeks time. a lot more : )
read up on mites at our site and vpi.com, and then get it in gear, and get rid of the mites.
best of luck, if you act soon enough, your chances are good.
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robyn@proexotics.com
Pro Exotics Reptiles