http://boards.webmd.com/webx?THDX@@.899fc941!thdchild=.899fc941
a link to a REALLY informative post.
You need to call your OB ASAP.
Yes it will effect the baby, and you as well, which is why you are advised not to conceive for a while post RAI.
I would call you doc immediately! How big was the dose of RAI? Did they not test you before you had the RAI? Or have you since conceived? No matter what the answer, I'd call your Endo and your OB ASAP!