After my last posting, my doctor confirmed that I was 7 weeks pregnant, with the Mirena still in place.
At 8 weeks, I had another ultrasound to determine if the doctor could remove the Mirena without causing a miscarriage, but at that time there was no fetal heartbeat. I had miscarried somewhere between the 7th and 8th week.
I had the Mirena removed- my doctor does not recommend that I use it again, since it already failed once. My husband is scheduled for a vasectomy.