Mama, please talk to your OB right away about your FT4 levels, thyroid stuff during pregnancy talaga needs medical supervision kasi it affects baby. Hindi ako pwedeng mag-advice about any medicine, even kung anong brand, pero your doctor will know exactly what's safe for you and baby at third trimester mo. Please don't delay this, your OB needs to check you. Sending love, alam ko stressful ito!