If you miss a day of Mafron, it can lead to contraceptive failure. If you have sex after missing a dose, you must take other contraceptive measures, because if you miss only one day, you may also get pregnant, in which case you need to use condoms or other contraceptive methods. If there is no bleeding, it can be ignored. If there is a small amount of vaginal bleeding and it is less than a menstrual period, you can take an additional dose of Mafron, which is two pills per day. If the missed dose is within 12 hours, you can hurry to make up for it, and you need to continue taking the pill that night.