Hayley, your TSH is above the reference range and your FT4 is within range so you are technically sub clinically hypothyroid and this is probably why your cycle is irregular and you are finding it difficult to conceive.
NICE recommends that TSH of women planning to conceive or newly pregnant should be in the low/normal range 0.4-2.0. This aids conception, reduces risk of miscarriage and ensures good foetal development during the first trimester when the foetus is dependant on maternal thyroid hormone.
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