The purpose of this study is to study the effect of Drospirenone on cervical mucus change by modified Insler score, pre-bariatric surgery and post-bariatric surgery
Thai women aged 18-45 years who are obese and had an appointment for Bariatric surgery at Chulalongkorn Hospital
Need contraception
Able to use non-hormonal contraception during the study
Giving consent
Pregnancy or history of giving birth within 3 months
Breastfeeding within the 6 months
History of using DMPA within 12 months
History of using other types of hormonal birth control pills within 4 weeks