I don't work in sexual health, or even health for that matter but I would hazard a guess that only a very small minority of young couples manage to reproduce accidentally due to knowing nothing about contraception. I tend to think that the vast majority of teenage pregnancies are probably due to low self esteem issues which manifests itself in the inability to resist peer pressure, the need to prove sexual prowess and even the desire to create a person that will provide a focus for one's emotions and a source of unconditional love.
Anyone agree/disagree?