Thyroid issues and TSH

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Hello everyone, I am 7 weeks pregnant and I have got TSH 8.28 miu/L and T4 as 10 , I have read that high TSH is not good for brain development. My Dr didn’t gave any supplement for this and said will see again after 5-6 weeks. Any suggestions as by next 5-6 weeks I will be towards end of my first trimester and proper thyroid hormone is necessary in first trimester for brain development. Please help.