please the emergency contraceptive works within 72 hours after unprotected sex. after sex, the sperm can live for a maximum of 5 days. this means that, if the contraceptive is not taken earlier you have a higher chance of getting pregnant. however, the contraceptive prevents implantation, so if it can prevent pregnancy if taken earlier.
In conclusion, if you took the pill within 24 hours of unprotected sex, your chances of getting pregnant is low