to have a safe pregnancy hypothyroidism
has to be well controlled. for which you need to get free T3,T4 and TSH level
. high TSH level and low T3, T4 suggests uncontrolled hypothyroidism. depending upon the above reports the dose of Eltroxin can be increased till you get normal hormonal levels. required dose of Eltroxin can be taken as single dose or in two divided doses. my adviced to you is that better to consult ENDOCRINOLOGIST
for further management, because you have already concieved.
take care and have safe pregnancy with cute baby