Okay so I take Thyroid medication for an underactive thyroid. I've heard repeatedly that you're supposed to wait at least 3 to 4 hours between your thyroid medicine and your prenatal vitamin (because it contains iron the prenatal vitamin can mess with the absorption of the thyroid medicine ). Well, tonight I totally forgot and ended up taking my prenatal not even two hours after the thyroid medication. This is the first time this has happened since I've been pregnant. I don't know, maybe I'm overreacting, it's only happened this one time, but I just can't help worrying!