"i had mirena inserted in april of 2015. the insertion was painful for me, as i have not ever been pregnant and given birth. i had light spotting for two weeks after insertion and then when i thought my body was adjusting, i would spot throughout the following months. it wasn&#039;t until month 6 that the spotting stopped. it was also in month 6 that i discovered one mass in each of my breasts, one the size of a walnut and the other the size of a small gumball. i really did enjoy having no periods with mirena, but i had it removed at month 9, with a pending breast ultrasound and mammogram at age 26."