IUD Moved

My IUD went into a very low and into a very dangerous angel. If I hadn't gone into my doctor when I did it would have perforated soon. How often does that actually happen? I bailed on 5 IUD insertion appointments in the last 4 years because this was my biggest fear. Finally I just did it. And then it happened. I actually had very little pain or discomfort that keyed me in. I only had it for three months. I guess I just want to know if other people have experienced this.