No & no: Irregular menses is very common in young women. Hormonal birth control can help regulate one's periods. Very unlikely to be pregnant if taking pills daily as directed w/o fail and especially if engaging in protected sex which also lowers risk for sexually transmitted diseases/infections (although not 100% risk free). See FamilyDoc, GYN or Planned Parenthood if still concerned.
Answered 7/5/2015
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