A member asked:

What does it mean when your period comes early when your on the birth control pills for a year?

A doctor has provided 1 answer

Hormones Fluctuate: Hormone levels fluctuate during the cycle, even with birth control use. Cycles can occasionally become irregular due to this process. Missing a dose of birth control can also affect the menstrual cycle. Oral birth control is effective, but not 100% effective and pregnancy can still occur.

Answered 2/11/2015

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