Hashimoto's thyroiditis and pregnancy have an impact?

Hashimoto's thyroiditis has an impact on pregnancy, first of all, according to whether thyroiditis leads to hyperthyroidism or hypothyroidism in patients, if thyroiditis is mild, does not lead to hyperthyroidism or hypothyroidism in patients, the impact on pregnancy is not large, but if Hashimoto's thyroiditis has led to hyperthyroidism and hypothyroidism in patients, it may affect fetal development.