Here is a good article in the National Catholic Register "Why We Quit Contraception
Two couples tell their ‘conversion’ stories"
I do think that we need to rename Natural Family Planning. To often the idea of artificial contrasted to natural gives a false idea of why contraception is wrong. As if organic contraception would be alright. I would call it Supernatural Family Planning, that is any spacing of births done for serious reasons via periodic abstinence is in response to prayer and a docility to God’s will.