Key Inclusion Criteria:  Chinese women between the ages of 21 to 40 years at the time of signing the informed consent form Non-users or users of the combined oral contraceptive (COC) pill who describe experiencing menstrual cycles of 24 to 35 days in duration (both inclusive) Healthy according to medical history, physical and gynecological examinations, vital signs, 12-lead electrocardiogram, and laboratory tests in blood and urine Serum FSH levels ≤5 IU/L and estradiol levels ≤50 pg/mL on Day -3 and Day -1 in TP1  Key Exclusion Criteria:  Any finding at the gynecological examination, transvaginal ultrasound or by cervical smear that is considered medically important A history of medical problems that could affect the functioning of the reproductive organs (ovaries and womb) A history of any medical problems that may prevent use of the combined hormonal contraceptive pill