If she is hypothyroid and pregnant she will need to be monitored closely and will most likely need to incrase her thyroid meds (Very important for a healthy pregnancy).
Please go back to the Dr asap and let him know that your wife is pregnant and follow appropriate instructions.
Whenever we try to assess lab results, it is necessary to compare the results to their reference ranges shown on the lab report. So, please post the reference ranges. Also, is she having any symptoms that may relate to thyroid issues?