A
TSH of 4 in the first trimester is a little above what's ideally wanted in pregnancy, since pregnancy needs tighter
thyroid control than usual. This doesn't mean anything is seriously wrong, but it often calls for a small dose of thyroid medicine such as levothyroxine, especially this early when your baby depends fully on your own thyroid hormone.
Next Steps
Get a repeat
TSH along with free T4 and
thyroid antibodies if these haven't been done, and discuss this with your obstetrician this week so treatment can start without delay if needed.
Health Tips
Please don't start or guess a dose on your own. The right starting dose depends on your exact
TSH, weight and antibody status.