I had a Mirena inserted 4 weeks ago and been bleeding ever since. Gp has checked there are no signs of infection and prescribed norethisterone for 10 days and suggested I take iron supplements. She did not sound v convinced it would work, and there are lots of people saying it actually made things worse. I have form for feeling crap on protestagens, the whole point of the coil was it was lower dose than the mini pill. 