Y'know, being pregnant doesn't mean you shouldn't see the doc for an issue you'd see a doc for if you weren't pregnant.
I've been doing the "I'm cold" thing, too. (Most amusing as my mother is prone to hot flashes and the room is seldom comfortable for both of us, lol), and since I've been hypothyroidic since I was 11 or so (and on synthroid for it), I told my sOB so she could test my TSH levels.
I'm currently facing having to convince her that this doesn't necessitate being labeled "high risk" and visits to the clinic every two weeks. If my medication needs to be increased, there's no point in checking it again for four to six weeks, so if it doesn't increase, the same logic still applies.
That being said, untreated hypothyroidism can be a genuine high-risk factor. (I did some research after listening to my doc's bs.) The stress here is UNTREATED. My advice is, go to your regular doctor (not OB), and get the TSH test done. If your regular doc has experience w/ treating hypo, and you are, then have him prescribe your med and INFORM your OB or midwife. If not, see an endocrinologist about medication.
One reason I'm SO looking forward to moving is that I can see the midwife about the pregnancy, and a doc about my thyroid. It's relevant to hypothyroid treatment that the doc and lab know you're pregnant as the range is different for the test, but it's not relative, once you're in a healthy range, to your pregnacy that you have this condition IF IT'S TREATED.
Sorry if I seem to ramble, I'm psyching myself up for my appointment this afternoon. It's got me so wound up I woke up at five this morning and lay awake for forty minutes, then gave up and got up. It's still an hour and a half before my wake-up time! And I didn't even go to bed early (even though I was tired) OR take a nap yesterday! Have I mentioned here that my sleeping patterns have been all out of whack?
I also can't sleep flat on my stomach comfortably any more.