"i&#039;ve been on nexplanon for 2 years and 1 month. it has worked perfectly on not letting me get pregnant, but i almost don&#039;t get my period, and once i thought i had it and it was here for one day. then the next time it came and lasted 21 days. i really have no complaints with the period thing, but now i always have severe migraines, sudden nausea, breast pain, almost no desire to be intimate and my mood swings are unpredictable and just as bad."