The appearance of unexpected vaginal bleeding between one cycle and the next is really very rare, especially with the ring, which is the hormonal contraceptive method that best controls the monthly cycle. The things to do in this case are different depending on whether you inserted the ring correctly or not. It may be necessary to use hygienic protection. In any case, leave the ring in the vagina and continue to use it normally. Consult your gynecologist if the irregular bleeding continues, becomes intense or reoccurs.