H.G.
Yes, I did. I already have a Thyroid disorder and it was "off" while I was pregnant. I simply had to take medicine. Thyroid is very important during pregnancy, especially the first trimester. There is no need to fear if you get it treated. From what I remember reading and from my endocryn while I was pregnant, the only thing to fear about a thyroid disorder while pregnant is not getting it treated.
My daughter is nearly 4 now and very intelligent. She has no problems. I was medicated my 2nd and 3rd trimesters (didn't know I was pregnant until 14 weeks).
Good luck! I'm sure you'll do great!