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You are seeing a 14-year-old girl with menorrhagia. She had menarche at age 12 ½ years, and has had very irregular, sometimes heavy menses since then. She currently has been menstruating for 8 days with no slowing of her menses, using several pads per day. Her hemoglobin is 10.5 g/dL and her pregnancy test is negative.

Which of the following can be used to treat her?