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In addition to an increase level of TSH above 2.5 mU/L during the first trimester, and above 3 mU/L in the second and third trimester, a decrease fT4 concentration (also using reference range for pregnant women) will help clinicians diagnose overt hypothyroidism during pregnancy.
Keep in mind that you still need prenatal vitamins, at least eight glasses of water a day and 1,000 milligrams of calcium daily. Keep moving. As long as you're not at risk for delivering a preterm baby, exercise is safe in the third trimester.