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Probability of pregnancy after unprotected intercourse by timing of coitus

Probability of pregnancy after unprotected intercourse by timing of coitus
3 days before ovulation 15 percent
1 or 2 days before ovulation 30 percent
Day of ovulation 12 percent
1 or 2 days after ovulation Near zero
Adapted from: Trusell J, Rodríguez G, Ellertson C. New Estimates of the Effectiveness of the Yuzpe Regimen of Emergency Contraception. Contraception 1998; 57:363.
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