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It is possible to use a combined contraceptive pill in order to regulate your menstrual cycle and in turn control the timing of your treatment. The pill is taken for 21 days then you break for 7 days. When you stop the pill on day 21 your period will begin approx. 3-4 days later. You then begin the new pill cycle after the 7 day break thus regulating your cycle to 28 days. We can then plan ahead for your treatment date.