Our expert says:
You are suppose to insert the ring for a period of three weeks, remove it for a period of one week, in order to experience a normal menstrual cycle. If you replace it every four weeks, you will experience abnormal bleeding. You should leave it out for a week now and replace it with a new one for a period of three weeks.
Refer to the following link: http://en.wikipedia.org/wiki/Nuvaring
Dr Anrich Burger
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