Because : the months have variable # of days, there will be some fluctuation for the date the period comes on. Additionally estrogen/ progesterone imbalance can throw things off from time to time.
Answered 10/11/2014
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Check pregnancy test: A home pregnancy test will be highly accurate as it has been >2 wks since ur last act of unprotected sex, if u had unprotected sex. If negative, it is not uncommon for young women to have their menses come late or to completely miss one, sometimes with spotting. Marked weight loss, excessive exercise, illness and emotional stress are common causes for this.
Answered 1/21/2017
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