thanks for the query.
Normal levels of TSH during second trimester is 0.2 - 3.5 mU/L. It would be better if you get your free t3 and t4 levels.
You have sub-clinical hypothyroidism
If you don't start thyroxin, there are chances that your baby to have congenital cretinism
. better to start thyroxin as early as possible.
The normal side effects can include: nausea, drowsiness
, weight gain .
Stop using Thyroxin and get emergency medical help
if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:headache;sleep problems (insomnia
);nervous or irritable feeling;fever, hot flashes and sweating.
hope this helps.