I'm wondering if I was pregnant when I had my iud inserted. Reading some
Posts, I've seen others say that they were pregnant and got negative results. I had a miscarriage, had the mirena inserted and now I feel just like I did when I was pregnant. I'm having irregular periods and spotting? Anybody with similar symptoms?

You can get pregnant with an IUD. Some women just can't handle the side effects. This site has some good info. You should talk to your doctor.

Intrauterine Devices: IUD : American Pregnancy Association