Been on topamax (topiramate) for a little over a month. Today im having lower right side back pain, should I be concerned about kidney stones? I drink a lot of h2o

It is possible. Kidney stones occur in about 1% of the population taking topamax (topiramate). If you are feeling like this may be an issue, you need to inform your doctor asap and get checked for it. They may also want to change to a different medication to avoid this problem in the future.
Check a urine specim. Have the doctor who prescribed your topamax (topiramate) order a urinalysis for you. And drink 4-5 glasses of water daily on this medication.