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Even though T3 &T4 were normal , the TSH was high which indicates that you have low thyroid hormones. That is why you were kept on thyroid replacement medication- Thyronorm.
It may happen at any time. Pregnancy aggravates the problem. Continue Thyronorm. measure the TSH intermittently and see the levels and work with doctor. You may have to continue it for long.
It is better idea to consult Endocrinologist
once during the course.
Side effects of Thyronorm are:
, excitability, tremor, muscle weakness
, cramps; sweating, flushing, heat intolerance, headache, insomnia, tachycardia
, palpitations, angina pectoris
, excessive wt loss; menstrual irregularities; diarrhoea, vomiting.
Regards Dr. Jagdish