Hi
You can check out this thread too : TTC with thyroid issues

I found it wasn't too hard to keep on top of things while pregnant. Went from 100 to 130 once pg and it stayed pretty steady throughout. If you're monitoring things and treating it, then there's not too much risk to your baby or pregnancy. My only problem was that I should have increased my dosage while doing IVF, but fs overlooked that one...
Also a bonus - I found i felt the BEST I have felt in years during the second trimester...