Hello, I am 4 weeks and 2 days pregnant. I had Grave's Disease as a teenager and took radioactive iodine to treat the problem. I've been on Synthroid for almost 20 years. My first OB/GYN visit is scheduled in 18 days, so I'll be 6 weeks and 6 days pregnant then. My GP does thyroid lab work for me annually, but plans to let the OB/GYN take care of it during the pregnancy. I'll insist that my TSH is checked during the first visit. Can I wait until I'm almost 7 weeks pregnant to get my TSH tested (my OB/GYN says I can, but I want a second opinion from an endocrinologist)? My TSH and FT3 and FT4 levels were tested about 3 weeks ago and were 0.28 uIU/mL (TSH), 2.82 pg/mL (FT3), and 1.31 ng/mL (FT4), so my doctor lowered my Synthroid dose from 137 mcg to 125 mcg. I've had a miscarriage in the past and have a fear that by waiting until 7 weeks pregnant to check my thyroid levels that I'll have another miscarriage. Thank you.