Irregular periods require investigation

DEAR DR. GOTT: My daughter is 19 and has always had irregular periods (every other month or longer). Her last period was in February. She is not sexually active, and a gynecological exam was normal. The doctor prescribed Provera and wanted to start her on a regimen of birth-control pills. She has a history of migraines and is reluctant to try this treatment. What are her options? She had a lifestyle change living away at college last year but did not have a weight change. Many times, she will have PMS but won’t have her cycle. Should we get another exam that includes a thyroid check or anything other than a routine gynecological exam?
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