Trying for baby #3

I had my iud taken out in December had a full period this month. it was 7 days and now I'm having another period. My 2 children are with another guy and my now fiance and I want to have his first child. today was susposed to be special ( wild crazy sex) lol and I go to take a pregnancy test today because I thought I was spotting . and I got a BFN. BUT HAVE ANY OF YOU Ladies had the iud and had problems with periods?? I'm not sure what I'm trying to ask I'm so heart broken because I want another baby and have crazy sex. and all I am now is moody...grrrrr