Yes.. Thyroid disease can affect fertility.When your thyroid doesn't function well,it can affect every aspect of your health, weight, depression and energy levels..It is the master gland of metabolism.You may have had a TSH test and been told that your thyroid level is abnormal,TSH with over 4.5 is considered as hypothyroid(underactive) and under .5 is considered as hyper thyroid(overactive)..I think Your will come under the second ,hyperthyroidism.that's why your doctor told you to not conceive when you have medicines.because when the body delivers too much thyroid hormone, both the mother and the baby can suffer. Miscarriages, premature births, and intrauterine growth retardation can occur when it is untreated. Pregnant women with hyperthyroidism can also develop high blood pressure,and are at greater risk of heart conditions.so when you keep trying when you get cured..