FSH high on day 7?

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My FSH came back high (12.6) on day 7 of my cycle. My RE says I have premature ovarian aging... I’m only 31 and freaking out (like really really freaking out). Does it matter that he didn’t test on CD3? I know I wasn’t close to ovulation when he tested (I don’t ovulate until like CD21)... but when my ob-gyn tested me a couple months ago my FSH was only 4.9. Still waiting for the AMH result.

Anyone else have a similar experience?! SOS