Hashimoto's but low TSH (and pregnant)

[bearbait]

I'm 14 weeks pregnant with my second child. I've never been diagnosed with any thyroid problems before. At 10 weeks, my OB did routine bloodwork & told me my thyroid levels were high and that I was hyperthyroid.
TSH - 0.01 (0.4-5.5)
T4, total - 15.9 (4.5-12.5)
T3 uptake - 29.2% (27.8-40.7)
T4, free - 4.6 (1.6-3.7)
I went to an endocrinologist, who did a physical exam & said I seemed fine, no physical symptoms. She did bloodwork (this was when I was 13 weeks pregnant), and the results came back that my TSH was still 0.01, though the other numbers were better. However, she said I also had the Hashimoto's antibodies. I am supposed to get bloodwork done at the beginning of February, and if the TSH doesn't get better I'll start meds. She thinks the TSH may just be out of wack b/c I'm pregnant. Any thoughts??
The only symptoms I've ever had the would indicate thyroud problems are premature greying, low basal temperature, and being colder than everyone else (when I was pregnant with my first I was always hot, which continued until I stopped nursing, then I started to get cold again sometimes). No other symptoms though.
Thanks!

[Mark Lupo, M.D.]

low tsh is likely due to early pregnancy.  would want to test TSH receptor antibodies for graves however and keep a close eye on thyroid levels which should start to improve in the next 4-6 weeks.