Fertility Question!

Janet • Married 5/14/16. Will be mommy to a little lady Sept '17! ❤️
Hey guys,
About a year ago I had an IUD and I got pregnant with it still perfectly in place. It was making me feel horrible so I had it taken out, which unfortunately caused me to have a miscarriage. The doctor said that if you get pregnant with an IUD you're very fertile. Is that always the case??
Wondering if anyone has ever had the same experience.
Thanks so much!