Clinical Study Investigating the Conversion of the Contraceptive Compound Norethisterone Within the Body Towards the Contraceptive Compound Ethinylestradiol

Inclusion Criteria: * Healthy female subject * Age: 18 to 45 years (inclusive) at the first screening examination / visit * Body mass index (BMI): above or equal 18 and below or equal 30 kg / m² * At least 3 months since delivery, abortion, or lactation before the first screening examination / visit Exclusion Criteria: * \- Incompletely cured pre-existing diseases for which it can be assumed that the absorption, distribution, metabolism, elimination and effects of the study drugs will not be normal * Liver diseases, kidney diseases, metabolic disorders, thyroid disorders and known or suspected malignant or benign tumors * Presence or a history of venous or arterial thrombotic/thromboembolic events * Migraine with neurologic symptoms (complicated migraine) * Clinically significant depression * Pancreatitis or a history thereof if associated with severe hypertriglyceridemia * Use of systemic or topical medicines or substances which oppose the study objectives or which might influence them