Hi, I am currently 30 weeks and was also tested for this because of extreme fatigue(through my Primary doctor). I tested very low for my t4 as well. My doctor hasnt put me on anything,he just wants to retest my blood in April. I'm not really sure why he hasnt done anything for me,because I am still dragging and wanna sleep all the time. It's scary all the stuff you learn about this condition on the internet. Best thing to do is just talk to your OB and see what will apply for you,as everyone is different. I think my doctor wanted to wait to see if any levels changed before he did anything about it...guess I'll find out in April. In the mean time though I am tired of being tired!! Sorry I couldnt give you more information,wish I had some for myself as well