Recommended testing and levels during pregnancy

Knowledge is power and you need to be your own health advocate and tell your doctors what YOU want. I know you have heard it before and it may be hard to speak up, but it truly important that you feel comfortable with the care you are getting.
That being said, my PCP gave me a ridiculous range for TSH levels that I didn't agree with back when I was first diagnosed. That's when I went to the endo and he agreed with with the levels I thought were appropriate and upped my synthroid. If you doctor is telling you what they think is normal and you don't agree, tell them or find another doctor who will.
Here are some recommendations for frequency of testing and what your levels should be throughout pregnancy.

According to the Guidelines of the American Thyroid Association for the Diagnosis and Management of Thyroid Disease during Pregnancy and Postpartum:

RECOMMENDATION 2 – Trimester-specific reference ranges for TSH are recommended: first trimester, 0.1–2.5 mIU/L; second trimester, 0.2–3.0 mIU/L; third trimester, 0.3–3.0 mIU/L.

RECOMMENDATION 16 – In pregnant patients with treated hypothyroidism, maternal serum TSH should be monitored approximately every 4 weeks during the first half of pregnancy because further dose adjustments are often required.

RECOMMENDATION 17 – In pregnant patients with treated hypothyroidism, maternal TSH should be checked at least once between 26 and 32 weeks gestation 

Baby is 4 weeks and 6 days!