Pregnancy question

My daughter just told me she is pregnant. I am wondering if I should encourage her to take iodine. Some of the literature says it is important during pregnancy for the babies health and intelligence.

But on the other hand, even small amounts make people detox metals and fluoride and bromides etc. Would that be harmful to the fetus? My daughter is not that healthy to begin with.

Any suggestions on dosage in this situation? Would it make sense to use the drops externally?

Thanks everyone for all your great insights. It is a blessing to be able to read this forum everyday.