TTC after Mirena?

Anyone TTC after Mirena? My cycles started out 36 days, 32, then 28 days. I figured it meant cycle was regulating after IUD. I ovulated about 3/24. No period at day 39. Multiple Tests are negative. I spotted red one time on day 32. Some very light brown spotting day 39. My breasts have been very swollen and sore. I have a dr appointment in a week. Disappointing and annoying to have cycle go haywire.