I had mine put in mid march when i was mid cycle.. I had a bit of spotting for a day or so afterwards (but had also had a D&C to remove a polyp). My next period was 1/4 of the pain and blood loss as previous months had been which lasted about 4 days but then i had a contant spotting for another 10 days or so til i was mid cyle again. I did notice however an unusual odour that was worse when i had my period and when i mentioned it to my OB/GYN she said about half of her patients had said the same but it had gone after a few months. I then had another period with ongoing light spotting (really only used a panty liner) and more than anything it was just blood stained mucas more so than actueal blood. I am mid cycle again now and have has stained mucus again but still only enough for a liner.
I am not getting the mid cycle pain or period pain like i did before the mirena. My OB/GYN did say that it can take 6 months to settle my periods to almost and if not nothing. So i should have 2 down and 4 months to go!! but i guess we will wait and see.
I have had a few pimples which i was not getting before, and seem a little hungrier but other than that i am happy with the choice i made so far.