Thought the coil also left open the (very nasty) possibility of eptopic pregnancies - but there may be various sorts of coil; is this the one with hormones in it too?

At this point in the conversation I usually plug the injection of depo-provera, which has nasty side effects for some but is perfectly safe and healthy for many. And it stops your periods! I also think it's a similar price to the pill. However it isn't a good idea to promote it to teens because it interferes with laying down bone density (which is more or less done by the time you're 22ish).