Need a little help! !!

Brandi
Had the mirena taken out in October 2014. Found out I had cervical cancer in December. Had surgery that was successful of removing cancer. Didn't have AF the whole time I had mirena. AF didn't show until after surgery. Been TTC since before I found out about cancer and can't pin point Ovulation day. My last AF was 3/3 for 5 days. With a bunch of research I was supposed to ovulate on the 11th (different sites say different days) BD on the 12th and for the past 2 days I have had mild cramping. Anyone have an experience with the mirena? Or any information will help!!