I got a printout straight from the lab this time, rather than from my doctor, and i noticed they have different ranges, although both state the reference range applies to pregnancy. Not sure what to infer from that but i've asked for a printout from my doctor as well so i'll pick that up tomorrow. Will get a call from my doctor next week if she wants me to change my dosage.
My TSH has reduced from 5.94 to 2.46. My doctor wanted it between 1 and 2. My T4 has gone up slightly, to be just above the lab's normal range (and just within the range from my doctor on my previous test), but their comment is that it's consistent with adequate replacement. T3 is well within normal range.