Yep, you are pregnant.
Your doctor should have given you an ultrasound instead of waiting for a blood test. He must determine if this is a viable uterine pregnancy or an ectopic, which is a higher risk on the IUD.
If it is a viable uterine pregnancy you will have to make some decisions.
There are three options: leave the IUD and the pregnancy in place, take out the IUD and see what happens or take out the IUD and terminate the pregnancy.
If you are against termination and wish to carry the pregnancy to term I would STRONGLY recommend seeing a doctor that has experience with this! There is risk of miscarriage with both leaving the IUD in place and with taking it out.
You should be given an ultrasound to determine how the IUD is located in your uterus in relation to the embryo. If it is "behind" the embryo, you will most certainly miscarry, if you have it removed.
If it is "next to" or "below" the embryo it might be removed more easily. If you wish to keep this pregnancy the IUD should be removed very carefully and under ultrasound guidance, an experienced practitioner should be able to do this while trying to leave your pregnancy intact. No guarantees though...
Overall it is better (for your health) to have it removed but I personally believe that you need to know that leaving it in place is an option if that is your wish.
If you and your doctor decide to leave it in place, you will be more susceptible to pregnancy complications such as premature birth, infection and stillbirth, but the copper IUD is not believed to cause birth defects.
I hope everything turns out well.
Good luck.