I actually asked my endo this exact question today because I am heading towards RAI if my uptake scan is good in a few weeks and I wondered how soon I could get pregnant again. Everything I read online seemed to say that you need to wait at least 6 months, some say as long as a year, before getting pregnant or there would be negative effects on the baby. However, my endo said today that you only need to wait 1 month to get it out of your system and then the concern is just making sure the hypothyroid stuff is controlled during your pregnancy; I couldn’t tell from your post which end you were concerned about (the fact that you had the radioactive in you or the hypothyroid you will be dealing with now) but at least as far as the radioactive stuff goes at least from what my doc said, it shouldn’t have any negative effect on your baby. Good luck! Cath