I have had a Mariana (IUD) in since December 2010..so almost a year and a half. Well. I got it only because my periods were so heavy. I RARELY have sex. But one week ago I did have sex and we did not use any protection and he c*me in me but like I said I have the IUD. Well I have not had my period at all in over a year . But suddenly last night I was spotting and it was old , brownish blood! Does this indicate anything? LIke I said I've never had sex since the IUD was implanted but I had it one week ago and this is the first time Ive bled at ALL in over a year.