in early pregnancy
2. still birth
3. pre mature baby
4. subnormal mental development of the baby
as well as chances of anaemia
and bleeding in mother also increases.
Ideally treatment should start with 100mcg and then increase 5 mcg per 2 weeks depending upon TSH and T4 level.
However you have not mentioned your T4 level here.
Anyway it is quite safe to take 75 mcg because TSH level
may rise again and then it will affect the fetus. So dont worry. Just check the TSH and T4 every month.
best of luck.