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.

Graphic 71494 Version 3.0

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Probability of pregnancy after unprotected intercourse by timing of coitus