In India many women suffer from hypothyroidism due to iodine deficiency. It is a condition when the thyroid gland secretes less of the hormone which leads to a sluggish metabolism and slowing of all other functions in the body. This makes conception difficult. In fact with an underlying problem like hypothyroidism it is advisable to consult your doctor pre-conception. Here is all you need to know about thyroid and pregnancy. How hypothyroidism affects conception? Low levels of thyroid hormone interfere with the functioning of the ovaries and make them produce less progesterone. It can interfere with ovulation which impairs fertility.