I have now tracked one full fertility cycle and this is my first chart. By measuring my basal body temperature and tracking the changes in cervical fluids I can determine when I'm fertile and not. P shows my peak day, my most fertile day. I'm using the app Kindara and I follow the rules partly from FAM (Fertility Awareness Method) and the Billings method.
Conclusion: I don't need to use hormone interfering contraceptives. Instead, I can follow the natural rhythm of my body. An empowering feeling!