Yes, it's safe. In fact, it's unsafe not to take thyroid medication during pregnancy if you need it. You'll need to take medication and be closely monitored.Treatment with sufficient amounts of thyroud hormone replacement significantly reduces the risk for developing pregnancy complications associated with hypothyroidism, such as premature birth, preeclampsia, miscarriage, postpartum hemorrhage, anemia and abruptio placentae. Moreover, during pregnancy, the thyroid gland needs to produce about 40 percent more thyroid hormone for both you and your developing baby. Women who don't receive enough thyroid hormone during pregnancy are at greater risk of complications. Stay in touch with your doctor. Wish you a Safe n Healthy pregnancy without worries.