Mirena Help!!!

For those of you who have had mirena removed how long after did it take for your cycle to regulate? I had my mirena removed on September 7th (4 months before my 5 year mark). I did not have a period the whole time I had it inserted and my doctor told me to expect some spotting after it was removed but that never happened. On September 24th I had very light spotting which I assumed to be my period but only lasted 3 days. My period went back to normal on October 24th and lasted my usual 5 days. Then again on November 20th and I thought my cycle was finally back to normal. However yesterday I started my period AGAIN and I am slightly heartbroken because this is supposed to be my fertile week. How is the even possible? Please someone HELP.