I have an IUD and I was told by many people that your body continually produces the blood that your body has normally before the IUD was inserted. If that is true, where does all of that blood get stored within the body? What I thought, was that the IUD prevented your body from producing the monthly menstruel cycle and the blood wasn't produced as much, hence the lighter periods. Please clear this up for me? I have heard some horror stories of women who have had scary issues because of built up/back up blood and Im nervous to whether or not they are true.