BCP did horrible terrible awful things to me. Made me horribly sick and I got every. single. side-effect. I would not recommend it to anyone, for any reason.
(That was of course years before I converted)
Napro is not just for help with conception, a Napro trained doc will actually try to find the REASON you are having problems. Most docs do not care WHY women have gynecological issues, they just want to cover up the symptoms with BCP so you don’t bother them anymore.

It’s all in your head anyway, right.

Napro docs try to find the root of the problem and actually TREAT it, not just bombard your system with artificial hormones so that you appear on the surface to be ‘regular’. They can do this with lab tests, and, yes, charting, to help find out what’s really wrong so that they can prescribe the proper treatment, whether that is medication, surgery, or something else.
I had gone to about 8 docs in as many years, and not one had a clue what was wrong with me. I went to a Napro nurse practitioner (not even an MD!) and she immediately knew from my charts that I had PCOS. She prescribed the proper medication (NOT BCP, like all the other docs had wanted me to use), and guess what? It worked! My symptoms disappeared over time, and I even managed to get pregnant!