 <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]  first Sunday following the beginning of your menstrual period. If your period begins on a Sunday, begin taking this medication on that day. Your pill pack contains 84 estrogen/progestin pills and 7 estrogen-only pills. Take one estrogen/progestin pill daily for 84 days in a row. The day after you finish all the combination pills, start taking one estrogen-only pill daily for 7 days in a row. You should have your period during the week you are taking the estrogen-only pills. The day after you take the last estrogen-only pill, start a new pack whether or not you have your period. If you do not get your period, consult your doctor. If this is the first time you are using this medication, 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 control the first week. Ask your doctor or pharmacist about how to switch from other forms of hormonal birth control (such as patch, other birth control pills) to this product. If any information is unclear, consult the Patient Information Leaflet or </s>