Thyroid levels and early pregnancy

Hi everyone, 
I had my thyroid levels tested about 6 weeks ago and the reading was 2.5, so not terrible but a little low functioning. I am now 5w2d and I had another test last week and the result was 3.37, so even lower functioning! 
I am starting to worry....
Does anyone have any experience with low thyroid functioning and healthy pregnancies? 
I lost my first baby at 7w, after seeing a healthy HB. My OBGYN thinks the miscarriage was due to a thin uterine lining from a recent iud removal. My naturopath is worried about thyroid levels and miscarriage. 
Any positive experiences would be great to hear right now! Thanks :)