[surbhi961993]

I had unprotected sex 10 days ago and my due mensuration date is 5-2-2014. But I still got no hints towards it. I took unwanted-72 in 40 hours... do I need to worry or the delay in mc is due to pill

[Curlyben]

Yes, yes and yes.
The use of emergency contraceptive can mess with your cycle.
As you had sex, of any sort, there is still a chance of pregnancy.
That being said it is still early, wait for Two weeks late and then test with HPT.

[Fr_Chuck]

I agree, the morning after pill, is not 100 percent effective, the longer you wait after sex the less effective it is.

You can not tell now. After you miss a period and are 14 days late, you can then test