I agree, slow down. I had trouble with getting pregnant with my hypothyroidism. It took us 5 years. At 36 I had a beautiful 9 pound girl.
Get yourself checked out and if need be get a second opinion and talk with your OB-GYN.
Slow down on the pregnancy thing until you have the pituitary problem diagnosed properly.
Ask for copies of your lab work and look them over carefully. See if they ran TSH, Free T4, and Free T3. Post the lab results pertaining to your thyroid here, and maybe we can help you sort it out.