| 11. | A preteen's first menstrual period or wet dream can be a terrifying experience.
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| 12. | _She misses at least three consecutive menstrual periods because of her low weight.
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| 13. | It's removed for one week to allow for a menstrual period.
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| 14. | She had two menstrual periods after stopping the hormones each time,
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| 15. | The girl replied that she had just started her menstrual period.
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| 16. | Young girls who are better nourished have menstrual periods at an earlier age.
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| 17. | As soon as she gets her menstrual period, this is the starting age.
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| 18. | Fertilization usually occurs about two weeks before the " next " expected menstrual period.
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| 19. | In some women it may be normal to have less bleeding during menstrual periods.
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| 20. | Not the heavy menstrual periods, or pain, or frequent urination.
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