"i&#039;m 18 with no children and had mirena inserted about 3 weeks ago. the procedure was pretty painful for me but it went quick and no tears so i got through that. i got right up and continued on the cramping, started instantly and was pretty intense, so i took something for it and called it a day early. i got the mirena inserted for regulation of my period, and because i&#039;m leaving for college and am aware that my schedule will get hectic so i wanted new source of birth control (i&#039;ve been on the pill since 12/13 yrs old) . i haven&#039;t had any other symptoms besides cramping. i rarely cramped before so this cramping to me is intense. they usually aren&#039;t continuous cramps, in and out something like a spasm."