Can Mirena Cause Pneumonia And Constipation?

I am a Forty-year-old female, and have had no problems with the Mirena since inserted two years ago. I have pressure that feels uncomfortable in my back, like from constipation. Took Mirelax one of the evenings about a week ago, and could go more regularly, but still thin as of today. The Only other factor is I had pneumonia a little over two weeks ago. Have had thin stools and feel constipated any suggestions? Thank you for your time.