These emergency pills are supposed to be taken within 72 hours of unprotected sex. Since your gf took the pill the very next day, it can be considered safe. But these pills also affect the menstrual cycle of a woman so be ready for that. Do not use these pills carelessly. These are to be taken only in emergency. For safe sex, use condoms and not the pill. You make promises to love your girlfriend, respect her and her body, too. https://lovematters.in/en/resource/safe-sex If you would like to join in on a further discussion on this topic, join our discussion board, "Just Ask” https://lovematters.in/en/forum