What are the reference ranges for the T3 and T4? Ranges vary from lab to lab and have to come from your own report.
Also, are they Free T3 and Free T4 or are they Total T3 and Total T4? They aren't the same tests and don't give the same information.
My research confirms that PTU can cause issues if taken during pregnancy. You should talk to your ob/gyn and see what other options may be available, since hyperthyroidism is not good either.
We'll be able to tell you more once we've seen the reference ranges for your labs and know if your T3 and T4 are Free or Totals.