M.N.
I got pregnant a month after have I131 treatment. We had been having major difficulty ttc prior to it so we weren't very careful afterwards, thinking that it still wouldn't happen - but it did. We were pretty scared at first of the possible risks to the baby but all of the radioactive iodine flushes from your system rather quickly anyway. The baby, now almost ten, happens to be gifted and talented - with a 97th % full scale IQ. :) Good luck!