can affect the females in many ways.
It can cause,
by preventing ovulation,
Chances of miscarriages are high in hypothyroid patients,
Chances of developing hypertension
Premature delivery can occur,
Baby intellectual potential may be affected.
But all these are with untreated hypothyroidism.
As your report is normal at present no need to worry.
May be your doctor called you for IUI on 13th day. During pregnancy
the need for thyroid hormone increase, so regular checkups needed and dose should be increased according to that.