ISSUES after Mirena

My husband and I are trying to convince our 2nd child together. After our son was born I went on the Mirena. I had it in for a year and half (removing January 2015). I had spotting for a few days after removal. Then nothing for a month then in March a super heavy cycle. Mind you when I went on the Mirena I was breastfeeding until our son was 11 months. Never had a period. Now I have had some light spotting. But I'm at a loss no period normal equals no ovulaton. We really would like to have a younger sibling for our little guy. Anyone else have this issue?