Oh yeah, very hard to get preggers with low thyroid. I'm going through a period of readjusting my thyroid meds, I think they're wrong right now... too low. I had my thyroid removed 17 or so years ago because of Graves disease.

Getting thyroid dosed correctly can be a biatch. I think I've been under dosed for most of the time I've been on them. Lots of interesting stuff in the thyroid section if you're concerned.