All of the following circumstances are reasons a backup method of contraception should be used EXCEPT:

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Most birth control methods have a period of adjustment or can be affected by external factors like medication, hence the need for backup contraception in scenarios A, B, and C. However, after years of effective use (D), if no other factors have changed, there typically isn't a need for a backup method, making it the exception.

All of the Following Circumstances Are Reasons a Backup Method