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    Hello and welcome – you might also visit our Facebook group (search for @GDATF) as that one tends to be more active than this forum. That’s a puzzle with the high T4 but normal TSH. Usually, it’s the TSH that goes out of range first when things are out of balance. Have you had antibodies tested recently? (TSI, TPO, TRAb) We don’t fully understand their impact on fertility and pregnancy, but it might shed some light as to what’s going on.