Having unprotected sex in the same evening does carry a risk of pregnancy, as it only takes one instance of unprotected intercourse to become pregnant. Emergency contraception can still be effective up to 72 hours after the incident, although its effectiveness may decrease over time. It is recommended to use a second form of contraception, such as a condom, to protect against sexually transmitted infections. If you have any concerns about confidentiality, you can rest assured that your medical information is kept private and only accessible to authorized healthcare professionals.