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I have a vaginal ring as a means of contraception. If I want to wear it continuously, do I change it every 3 weeks or every 4 weeks?

If you want to wear your vaginal ring continuously, you can keep it in place for 4 weeks, or 28 days. Studies have shown that the ring is effective for at least this duration. If you were to change it every 3 weeks instead, it would not be a problem, but you would be wasting a week's worth of use and would need to replace it more frequently, leading to higher costs.