Welcome again to EmpowHER. Thank you for addressing issues that can contribute to infertility in women.
I would like to clarify that hypothyroidism refers to an underactive thyroid gland. Low levels of thyroid hormone can interfere with ovulation, which impairs fertility.
A woman with untreated hypothyroidism is at the greatest risk for a miscarriage during her first trimester. Unless the case is mild, women with untreated hyperthyroidism are also at risk for miscarriage.