When should you get a thyroid test during pregnancy? At your first pregnancy check-up (booking visit) – ideally in the first trimester (before 12 weeks). This helps detect thyroid problems early, when treatment can make the biggest difference for you and your baby. If your first test is abnormal or you have higher risks – such as a family history of thyroid disease, previous miscarriages, infertility treatment, or known thyroid issues – your doctor may repeat the test each trimester or as needed. Why is thyroid testing important during pregnancy? Essential for your baby’s brain and growth In early pregnancy, your baby’s brain and nervous system depend entirely on your thyroid hormones. Prevents pregnancy complications Untreated thyroid disorders can increase the risk of miscarriage, premature birth, preeclampsia (high BP), or low birth weight. Keeps you healthy during pregnancy Early detection prevents symptoms like extreme tiredness, rapid weight changes, and swelling from becoming severe. Quick and simple It’s just a blood test measuring TSH, and sometimes Free T4 or T3. Easily treatable when caught early Most thyroid problems in pregnancy can be managed safely with medicines, keeping both mother and baby healthy. 💡 Takeaway: A simple thyroid blood test in early pregnancy is a small step that can make a big difference for your health and your baby’s future.