While you're within your right to refuse medical treatment, realize that if you get cancer you could be in agony for years until you finally succumb to it and die. Because the reproductive system in female bodies is so close to the bowels, it's easy for it to jump ship and migrate. What's worse? Agony and horrifying death, cancer eating your intestines until you have to wear a colostomy bag for the rest of your life and have a seriously compromised immune system where you get sick every other week, or a 5 minute exam?
Also, if your doctor does require an exam before she prescribes anymore medication, she's within HER right, since she can't, in good conscious, prescribe medication that could be harming you if you don't allow her to do her JOB and keep you healthy medically. Patients always have the right to say no, and doctors always have the right to tell their patient to seek treatment somewhere else if you refuse to follow their orders.