Coming off mirena birth control

I had to have my mirena surgically removed May 14, when in for about 4/5 years. I have had 2 cycles since. But I have no clue what my cycle is. I also have random spotting around day 8. My first cycle I was excited thinking it was implatation bleeding. But I had spoting today and I am only CD 18. My ovulation was posted as CD 13. However. I am trying to track my cycle with Ava, Glow, and Premom.....nothing agrees what my period cycle is. I am so frustrated :( we are TTC. I just want to know how long its going to take my body to normalize again.