I've had underactive thyroid for 4 years....I'm on 100mg levotheroxine. ..my TSH is 0.12...free t4 17.9. ...doc says that's fine. But I've read that TSH should be between 1-2 if trying to conceive. ..ive already had 2 miscarriages and feel they are not monitoring me. I have ask for my bloods to be taken as I'm feeling really tired. They always come back normal. My TSH ranges from 0.25 - 0.47. Last week the doc looked on 2 Australian websites to tell me she thinks my TSH is fine....please help does anyone know. I feel this is reason why I can't fall pregnant.