There is the least chance possible with an IUD over any other birth control method... I had mine for nearly the whole 5 years... Have you had any other syptoms at all? What ones? Have you done a HPT? If you have any worries, check with your GP about it and see what they tell you. They can also do a check to make sure for you.

Good luck! you have almost no chance of being pregnant right now, but it is better to be safe than sorry.