Trouble getting pregnant

Nicole
So I had the mirena IUD a few different times, this last time it was in for a little over 2 years. I had it removed because I was having pregnancy symptoms and it was really low.  Anyway, with my first child I had gotten pregnant the first cycle off the pill (I was 18 and married to a different guy than I am now...at age 24) well during my first marriage I had a mirena IUD removed and got pregnant the first cycle, had a miscarriage.  Got divorced and two years remarried. 
So it has been 9 month since my IUD was removed and we started actively ttc.  No luck at all.  I've had my hormones tested and was tested for pcos(results were negative). My periods are never on time anymore, they have been getting longer and longer apart starting about 4 months ago. 
Has this happened to anyone else? We want a baby so bad!