You may take the medication now if you want to, but it must be accompanied by the use of additional contraception
like the condom for the first two days. If started on day one of the menstrual cycle, immediate safety is ensured. It may be safe as far as the 5th day of the cycle to initiate the treatment, provided the duration of the cycle is longer than 25 days. You may consult your doctor for further suggestions. Take care.