 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST] , start a new pack the next day even if your period is continuing or if you do not have your period. If you do not get your period, consult your doctor. If you are taking certain medications (such as levodopa, levothyroxine, penicillamine, tetracyclines, quinolones such as ciprofloxacin) that can interact with iron, ask your doctor whether you should throw away the reminder pills (iron pills) each day rather than taking them. Iron can decrease the effect of these medications. If this is the first time you are using this medication and you are not switching from another form of hormonal birth control (such as patch, other birth control pills), take the first pill in the pack on the first Sunday following the beginning of your menstrual period or on the first day of your period. If your period begins on a Sunday, begin taking this medication on that day. For the first cycle of use only, use an additional form of non-hormonal birth control (such as condoms, spermicide) for the first 7 days to prevent pregnancy until the medication has enough time to work. If you start on the first day of your period, you do not need to use back-up birth </s>