13 weeks of low thyroid hormone, if it is hyperthyroidism may lead to fetal abortion, if no symptoms and FT3, FT4 normal, mostly physiological changes, basically no effect on the fetus.
1. Combined hyperthyroidism: 13 weeks of pregnancy combined with hyperthyroidism, in addition to the reduction of thyroid stimulating hormone, can also be found FT3, FT4 elevation, thyroid ultrasound abnormalities, if not treated in time may lead to fetal miscarriage, the pregnant woman may also be heart failure, eclampsia and other serious complications.
2. Physiological changes: 13 weeks of pregnancy in the early stages of pregnancy, HCG significantly higher will affect the thyroid stimulating hormone lower, with the increase in pregnancy weeks, HCG levels decline, thyroid stimulating hormone is often gradually recovered, belong to the physiological changes, no need for special intervention, regular obstetric examination can be.
If you find low thyroid stimulating hormone at 13 weeks of pregnancy, you should consult your obstetrician for evaluation to check for the presence of hyperthyroidism and other diseases to avoid adverse effects on the fetus.