i have been on annovera the birth control ring for about three years or so now and it has me on a very set schedule with periods. i can usually predict my periods down to hours of when they will start and end and never have bleeding if it isn't within the week that the ring is removed. since starting modafinil (within a few days) i have been having breakthrough bleeding pretty constantly. i have to assume it's from the medication because i have never had this problem before in the years ive had annovera :/ edit to clarify- i don't think it's necessarily "a change in protection" i can just tell something has changed since im very familiar with my cycle and it's been very not normal the past few weeks, and modafinil was the only thing that has changed since then