A quick google search shows absolutely no link between a Drug called Jodid, Pregnancy and elevation.
In fact, some of the links I found had negative things to say about Jodid during Pregnancy (Its also taken for heart conditions).
Sounds like typical German foolishness/myth. I wouldn't take it, but its your body/kid so do as you want.
Update: Seems Jodid (Hexal Jodid) is the commercial name of the drug, which is actually a form of POTASSIUM IODIDE.
Drugsafety.Com has this to say
The primary concern with the use of potassium iodide and the anti-infective iodine during pregnancy relates to the effect of iodide on the fetal thyroid gland. Because aqueous solutions of iodine are in equilibrium with the ionized form, all iodide or iodine products are considered as one group. Iodide readily crosses the placenta to the fetus. When used for prolonged periods or close to term, iodide may cause hypothyroidism and goiter in the fetus and newborn.
Seems like it can also cause problems long after use, esp. during breast feeding. Click the above link and scroll down..