 <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]  use back-up birth control the first week. Change the patch once a week on the same day. Remove the used patch before placing a new one. Apply the patch to a different area with each change to avoid skin irritation. After wearing patches for 3 weeks in a row, do not wear a patch during week 4. You should have your period during this time. After not wearing a patch for a week, apply a new patch whether or not you have your period. If you do not get your period, consult your doctor. Do not go longer than 7 days without a patch, since this will increase your chance of pregnancy. To help you remember, mark your calendar to remind yourself when to change or leave off patches. If the patch falls off, re-apply it or apply a new patch within 24 hours. If the patch is not replaced within 24 hours, or if you are not sure how long it has been off, start a new cycle by applying a new patch and use an additional form of non-hormonal birth control (such as condoms, spermicide) for the next 7 days to prevent pregnancy. After removing each patch, fold it in half so it sticks to itself, and discard in the trash away from children and pets. Do not flush the </s>