7 week preg, my tsh is 8.2 , earlier takng throxine sodium tab of 100 mg /6 dys.now endoc doc advsd me 112.5 mg/7 days, gynae 125 mg/7 dys.whom 2 follow?

Either is okay: Most people with hypothyroidism require more thyroxine during pregancy, typically 25 to 50% more. A typical initial increase is 30% (the dose recommended by the endo), but there is a good chance you would need more than that (the dose recommended by the gyn). As long as you have a repeat TSH is a few weeks, either is okay. An further adjustment can be made at that time.

Pick one and follow: Both regimens are acceptable as long as you follow up regularly with lab work. In general, we raise ur thyroid dose by 25% & follow with lab work to see if it's working. Does ur OB know that there's an endo taking care of you? Generally, the OB will leave the thyroid to the endo unless he/she has strong objections about the treatment plan. You should not have 2 docs doing the same the thing.