R., I had a copper IUD for about a year, on new years eve I took a pregnancy test and it was positive, went to the the doctor, the ultra sound could not find baby, but all other test were positive, after weeks of going back and forth to the OBGYN , getting shots to abort baby because it was not in my uterus, still all blood work said there was still a baby inside of me somewhere. All of this was very emotionally and physically painful. after missing six weeks of work I finally went back, two days after I returned, I stood up, then passed out, when I came to I was at the hospital, only to find out they had to perform emergency surgey, my tube was about to explode, I could have died from internal bleeding had that happened. My best advice is be careful!!!