See below: If you did the test correctly, at 20 days after a missed period and it was negative, you are not pregnant. Menstrual irregularities are not uncommon. If you miss more than two periods it would be time to see your doctor. Consult this site for more information on this topic. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/Pages/causes.aspx
Answered 9/22/2014
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