Uncertain Thyroid results. 4 years.

I underwent general check up with gynecologist for less menstrual bleed which lasts for only 1.5 days suffering since 3 years. But monthly it's regular on Avg of 32-35 days. Previously back 3 years, 3 days normally. On doing thyroid profiling now got 5.7 TSH level and prolactin 10.3 ng/mL . Doctor suggested me thyronorm 25 mcg. Had 2.36 TSH just a year back on testing. Again tested with different diagnostic center just after consultation got 3.7 TSH, T3 112ng/dl, T4 7 Mug/dl and prolactin 17.37 ng/mL now. Prolactin test were in range on both diagnostic center results. Still did not start thyronorm. So should I start tablet or again do thyroid test consulting other doctor. Also I am under gardinal 30 MG for NCC since 4 years.