A member asked:

How long does it take for lo loestrin fe to start fully preventing pregnancy?

A doctor has provided 1 answer
Dr. Bryan Treacy answered

Specializes in Gynecology

Variable: The onset of pregnancy protection from any birth control pill has traditionally been after one cycle (pack) has been completed. Most doctors recommend a back up birth control method during the first bcp pack.

Answered 11/27/2017

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