Talk to Endocrinologist on Elevated TSH/Recurrent Miscarriage

Aoa I just found out that I am 5 weeks pregnant. I have a history of 3 recurrent miscarriage, no living children. Patient of hashimoto. I was taking 50mcg thyroxine six days a week and 100mcg once a week and my level was maintained at 1.7-2 since a year. Dr has strictly adviced me to maintain it below 2.5 at any cost I repeated my tsh test with b-hcg and my current TSH is 4. I am extremely worried. My doctor's appointment is on Thursday. Please guide me how much dose should I increase from tomorrow to bring it down as soon as possible ??? Please help