Fertility treatments. Give some opinion!

I am trying for a baby for a past 1year. I am having pcod and hypothyroid (t3,t4 normal, TSH 5.2) ,Hb: 9.8. 3 cycles tried with letrozole but not worked. Last cycle tried with newmon injection and 3 eggs growth present. But periods came. My husband's seman analysis report is normal. I did Fallopian tube test which is normal. Uterus lining s normal. Egg growth is present every cycle when we did Follicular study and ovulation also present. But pregnancy is not happening. My doc s insisted us to do iUi but we are not interested. My thought is, everything is normal, may be my egg s not quality one. So if it's true, then how come iui will give good results. Is there mandatory to do iui. I thought to try again with some natural methods with ovulation induction. Initially I was 73 kg now I am 66 kgs. Give some opinion