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A Birth Control Pill Five by Five

Sensei Martini
asks:
I want to begin taking the birth control pill for the first time. Is it possible for me to start taking my first birth control pill on the SECOND day of my period? I won't be having unprotected sex. But if I start taking the birth control pill on the 2nd day is it less affective? And also after taking the birth control pill for a series of time, when is it 95% affective?...