what does your doctor say?
what! you never have to get an abortion! you baby most likely is progressing just fine and there is no reason to take his/her life. i hope everything works out for you.
Ok this is what i have found just having a quick look! I think it might be worth while discussing this with your doctor if you haven't already done so. Maybe there may not be a need for abortion
Pregnancy: The fetus begins taking up iodine into its’ thyroid at about 12 weeks gestation & exposure to radioactive iodine at this time can cause the thyroid to fail to develop. Pregnancy should be delayed four to six months after radioactive iodine therapy. However, unintended pregnancies during this interval should be allowed to proceed to term. Birth defects do not appear to be more common in women treated with radioactive iodine.
http://www.bouldermedicalcenter.com/articles/RAI_Rx.htm
Good Luck, I am sorry you have to go through this.