My menses irrigular and its delay in 71days. This is highest delay in my periord . HCG strip also negative. Im getting T4 tablet and folic acid as well. Can you pls advice.

With a negative urine test pregnancy is unlikely; repeat it once more to be sure. In an irregular cycle a delay this long usually means ovulation has not happened, and a thyroid problem can cause that, so have your thyroid level rechecked by your doctor. If you wish to conceive, ovulation should be assessed and treated if needed.