Progerterone and the IUD

I started to use the Morena IUD 3 years ago. It is good for 5 years. The first 2 1/2 years I did not have a period. I had my hormones checked 1 1/2 years ago and discovered I had Hypothyroid disease and low progesterone and Testosterone levels.

I am treating with Levothyroxin for the thyroid and natural Projest caplets and Test cream. I am on 300 mc of Prog daily and 1/8 tsp of test 3% cream daily. I started the hormones in June of 2009. Started getting my period in January of 2010. I have had the Mirena checked and it is still in place and fine. I now have regular periods and with heavy bleeding and cramps. Up until July of 2010 they were between 24-28 day cycle. In the beginning of August I had a period after only 11 days. Could the hormones be making this happen? I have had my levels checked and they are fine. I had my annual exam and it was normal. I don't want to stop the hormones. Maybe it is the Mirena. What do you think?