Nuvaring is a flexible plastic ring that releases a low dose of progestin and estrogen for 3 weeks. It is used as a contraceptive device. While inserted it releases the hormones which interfere with the normal hormonal production thus disabling the ovulation.


The approved Nuvaring regimen specifies insertion of the ring into the vagina for a three-week period, then removal of the ring for one week, during which a menstrual period is expected. Once the fourth week is over, the Nuvaring should be inserted again.


Given the data you provided (not inserting the Nuvaring on the beginning of the fifth week), it seems likely that you are at risk for pregnancy. Although the probability for conception is small (only one day was missed and you had intercourse one day before the day the ring should have been inserted again), the risk cannot be excluded completely, because sometimes the spermatozoids can survive for little more than one day.


So, you might want to take an emergency contraception just to minimize the risk of unwanted pregnancy, but first you are advised to visit your gynecologist whom you should consult on this issue in order to check if there are any contraindications for using an emergency contraception pill.