I am not too sure about harming the baby, I am not sure that it would as it is only replacing a hormone that you are obviously producing some of just not enough because you are pregnant. I was always under the impression that the baby takes what it needs first and then you get the left overs, so if you are producing some hormones then the baby would be getting what they need and you get the left overs. So you have probably been feeling tired etc. Try not to worry talk to your dr about it hopefully he will set your mind at ease. i take oroxine as i have hashimoto's disease. If you have any other questions just ask.

Take care Nikki