Birth Control Pills: The chemicals (progestins) in BCPs suppress the natural production of hormones, increase the risk of sexually transmitted diseases, and the inability to assimilate nutrients, all which prevent fertility. Deficiencies in Vitamins B6, B12, C, Folic Acid and Iron are all associated with BCP’s . It may also raise levels of Vitamin A to toxicity which is known as a cause of birth defects. See Progesterone F A Qs
Many women experience amenorrhea when they go off the pill which means failure to menstruate OR ovulate. All because the pill disrupts the normal flow of hormones from the hypothalamus in the brain to the pituitary gland and from there to the ovaries.
For more information on restoring ovulation and healing the ovaries after chemical birth control see: OvarInfo