June 6th, 2013

Science question - Mirena and periods

I know some of you love science and research, so maybe someone has something to say about this.
Since Mirena tends to lessen bleeding and even eliminates periods in some, is there any correlation between effectiveness of the IUD and periods?
I mean, if you have a Mirena and still get regular periods, is the IUD any less effective because of that?
I don't know if that is a silly question, but just wondering.  I know that progesterone-only BC methods tend to eliminate or reduce periods, but I don't seem to be so lucky!  I was on the mini-pill for about 8 or 9 months prior to my Mirena.  When my gyne Rx me that she told me I'd probably stop getting my period.  No such luck...it was there every month and even heavier at times.  Now I am almost 6 months into my Mirena and have had 6 periods, so I'm thinking my body just won't stop.  (they have been lighter than no BC periods, but tend to linger a bit longer).