Mafron is a short-acting oral contraceptive pill that is very effective and has a success rate of more than 99% if no dose is missed. However, when you take it for the first time on the first day of your period, you should take contraceptive measures if you have sex within a week, but after a week, there is no need to take other contraceptive measures. Take the pill for 21 days a month, stop taking it and wait for your period. In the second month, start taking it on the fifth day of your period, and then take it in the same way. If you miss a dose, you must make it up the next day. If you take it more regularly, you will not get pregnant, and the chance of pregnancy is very low as it is around 1%.