Missed period after taking out mirena

Sheba
Took out mirena in August 2015, bled for 6 days right after.... Then again in September for 6 days (heavy)... No period in October and It's now November and still nothing... From checking my cervical fluid I should have been ovulating between 11/5-11/7 so my husband and I had sex not stop... After not having my period again in November, I took a pregnancy test and it was negative... Has anyone had ovulation problems after mirena?