As you have very irregular periods
, that in itself could be causing the failure in conception. I would be able to comment better if you can provide all the hormone reports and any other tests done. You should have a trans-vaginal sonogram to see if the ovaries are normal. Tubal patency needs to be tested. Your partner should be assessed. Your TSH level
is normal but T4 is slightly on the higher side. Your BMI is high normal. Your ovulation status should be ascertained and intercourse timed and ovulation induction
is done if natural ovulation is inadequate or absent. Please get back with reports if you need further opinion or consult your doctor for further suggestions. Good luck.