hi, i actually do have hypothyroidism, it's non-hashimoto's (i was tested for anti-thyroid antibodies and it came back negative twice), and it was unmasked during my second pregnancy, although had tons of symptoms for most of my adolescence and young adulthood. it went back to normal after second pregnancy, but stuck around for good after the third. we are now almost trying for the fourth (about to rip up the kitchen, trying to lose 10 pounds before, so not not trying...). anyway, my need for thyroid medication goes up in pregnancy, and even if not pregnant, if my tsh and/or t4 are even slightly off (for me, tsh should be below 2, t4 should be around 1.3 - 1.5), my blood pressure goes up. my internist and ob (i just switched, i realized i didn't trust my old one to get me through a high-risk pregnancy, which was one of my main causes for trepidation regarding having a 4th) have both told me, "you know, thyroid problems can contribute to pe"). however, this is the first pregnancy where my thyroid will have been well-controlled during pregnancy, i got my old labs, and my thyroid near delivery both times it was checked showed clinically-low t4, and sub-clinically high tsh (2.8 ish, current recommendations as stated my my docs are 0.3 - 3.0), so it is really everyone's hope that if i can keep the thyroid under strict control this time (especially after delivery), my outcomes will stay similar or improve somewhat (i delivered at 37, 34, and 37 weeks, with post-partum pree all three times). my medical care plan includes monthly checks pre-conception, and thyroid and blood pressure checks twice a month (or even more often as needed) once i become pregnant, with the expectation that i will be on blood pressure medication the whole time, as well. they have both really let me know how high-risk i am ("are you sure you want to have another one?" and "i can't prevent you from getting pregnant," are some of the statements that have come out of both their mouths), but i am determined.
anyway, sorry for the long reply, i guess i just figured i would share what i had going on, in the hopes that some of it would help you. i have never had an identified auto-immune component to my thyroid issues, nor have i had graves' disease (however, i have a friend with graves' disease who had two term, non-pree pregnancies), so my issues might be only peripherally relevant.
pree X3, postpartum pree X3