In this post someone suggests pregnancy and other causes of high TSH:
http://www.medhelp.org/posts/Thyroid-Disorders/elevated-TSH/show/733543
Also try searching "TSH and pregnancy" on this site. Good idea until you get some responses.
I don't know as much as others on the board so hopefully others will post here. I don't know about a pregnancy link. I do know though to determine if you have a thyroid problem, you also need Free T3 and Free T4 testing.
Could you post your numbers and reference range?
Do you have thyroid symptoms?