Hi, Female on IUD birth control device are recommended to have reexamination and evaluation 4 to 12 weeks after insertion and once a year thereafter, or more frequently if clinically indicated by signs like fever, backache
or flank cramps or bleeding. Some of the complications which might develop after Mirena insertions are ectopic pregnancy
, PID (pelvic infection
, irregular bleeding or spotting.However usually one can have increased bleeding and spotting in the first few months and periods over time may become shorter, lighter or even stop. I would advise you to get an OBGYN
consult if symptoms persists and get a reevaluation done. Thanks and regards.