Diarrhea, vomiting, antibiotics can all make the pill much less effective in preventing pregnancy.
I'd heard that the pill was less effective for women who are overweight, but I didn't realize that the BMI "cut-off" point was so low. That would affect a heckuva lot of women out there...
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Our doubts are traitors,
And make us lose the good we oft might win
By fearing to attempt.
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