If you're pregnant and hypothyroid, you may need an increase in your dose of thyroid hormone replacement, even just a few weeks after conception, according to research reported in the New England Journal of Medicine. As many as 85 percent of pregnant women with hypothyroidism --a condition where the thyroid is unable to produce sufficient thyroid hormone -- require an increase in thyroid hormone replacement drug to protect the baby from cognitive problems or even stillbirth. Get the details now!