How effective is the ring at preventing pregnancy?

<p>If you always change the ring on time, it can be very effective. With perfect use, it&rsquo;s more than 99% effective. The way it&rsquo;s typically used, though, it&rsquo;s around 91% effective.</p> <p>In other words:</p> <p>Of those who use the ring exactly as directed, fewer than 1 in 100 will experience an accidental pregnancy during the first year of using this method.</p> <p>Of those who do not use the ring exactly as directed, 9 in 100 will experience an accidental pregnancy during the first year of using this method.</p>