The goal of this clinical trial is to learn if Estetrol/Drospirenone inhibit ovulation in quick-starting method. It will also learn about the safety of Estetrol/Drospirenone. The main questions it aims to answer are: 1. Does Estetrol/Drospirenone inhibit ovulation inferior to Ethinyl estradiol/Gestodene when starting on Day 7-9 of menstrual cycle? 2. What are the impacts of Estetrol/Drospirenone on ovarian activities when starting on Day 7-9 of menstrual cycle? 3. How does the cervical mucus change when starting Estetrol/Drospirenone on Day 7-9 of menstrual cycle? 4. What are the adverse effects when starting Estetrol/Drospirenone on Day 7-9 of menstrual cycle? Researchers will compare Estetrol/Drospirenone to Ethinyl estradiol/Gestodene to see if Estetrol/Drospirenone inhibit ovulation in quick-starting method.
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Rate of ovulation inhibition and classify ovarian activities using transvaginal ultrasound
Timeframe: 34-36 days