Hi, in june i underwent partial hysterectomy by assisted robotic method. from last week i am having pelvic pain . is it a symptom of scar tissue?

Not necessarily scar: Pelvic pain can have many causes. You should document the onset, character (sharp, dull, crampy, etc), and how often you're having the pain as well as if you are having any other symptoms (such as issues with urination or bowel movements). In addition, see if the pain gets better with ibuprofen or Tylenol (acetaminophen). Most importantly, you should call the doctor to set up an appointment to be evaluated.