I’ve never heard any facts on this one, but I do know that changing levels of estrogen/progesterone during times like menopause and puberty can throw your levels OFF ~ which is slightly different than throwing you out of remission. If your TSH/thyroid feedback loop is working right, that shouldn’t be a problem, and that’s thanks to your pituitary, not your thyroid. It’d be a good time to have more frequent monitoring, just in case.