Comparative 12 month study of menstrually-signalled use of a combined contraceptive pill versus a combined contraceptive vaginal ring

This study is comparing two types of hormone-based contraception used in a way that reduces or eliminates monthly periods: a combined contraceptive pill and a vaginal ring. Both methods are used continuously, with a short break only when bleeding or spotting lasts more than 4 days. The study runs for 12 months and looks at how well each method controls bleeding, how acceptable it is, and what women think about having fewer periods. You may be eligible if: - You are a woman between 18 and 45 years old - You need contraception and have no medical reason to avoid combined hormonal contraceptives - You are willing to be contacted monthly and keep a menstrual diary - You are willing to have blood tests at the start and end of the study You may NOT be eligible if: - You are currently pregnant or trying to become pregnant - You have had a sterilisation procedure - You are a smoker aged 35 or older - You have received depot contraceptive injections in the last 6 months - You have unexplained bleeding between periods - You are taking certain medications that may interfere with contraceptive hormones Talk to your doctor about whether this trial might be right for you.