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What Causes Delay In Menstruation?

hello there i am a 20 year old. I am concerned about my period because i am really regular but this past few months my perion has been coming one week late i took a pregnancy test but they al show negative results. i dont know what might be causing this. Any ideas? please help!!! thank

posted on Thu, 13 Mar 2014

Medically reviewed by Ask A Doctor - 24x7 Medical Review Team

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