Hello Doctor, Last year, My wife had irregular period cycle and weight gain problem then doctor done thyroid  and other tests and prescribed Eltroxin 25mcg tablets, with daily use of these tablets her tsh, t3 and t4 was in normal range. Now she is 18 week pregnant and she is taking Eltroxin 25mcg daily but T3 Total 3.18 ng/mL T4 Total 17.10 ug/dL TSH 1.89 ulU/mL are the levels in her current thyroid report. It means TSH is in normal range and T3 & T4 is increased. Please suggest this range of T3 and T4 is normal in pregnancy or not! If not then, what should we do??