I'm 18 and my boyfriend and I wish to become sexually active (we're both virgins). I've been doing some research on effective contraceptive methods and had recently discovered this method. My period is "regular" to me, only coming once every other month. It's been like that for the past couple years. I have a few questions: 1) How long does it take for the insertion to kick in? How long would we have to wait to have sex before the insertion is in full effect? 2) Would he be able to "finish" inside without any worries? 3) Would this method still be safe to use even with my odd period times?