Some women can be sensitive to the specific formulation of HRT. WOrth trying a switch from patch to gel or spray and adjusting the dose from there.
Likely contamination. Repeat bloods. Advise to omit HRT on the morning of the blood test.
If absorbing transdermal HRT effectively, FSH should be supressed.
Mirena coil for progesterone cover + transdermal oestrogen
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