Hi.. Primolut is a progesterone pill.. these pills can also act as a minipill which is a contraceptive pill, when used as one pill a day for not 28 days.. So I guess, if you are using primulut N three tablets a day for 10 to 14 days, then you may use the minipills one tablet a day for the next 14days so as to complete the birth control shedule.... Consult with your doctor if that is ok before trying this and if it can be done on long term basis, as I have less knowledge on this...