Had sex on the 16th of March 2014. Took postinor to the next morning as directed on its prescription. Had my withdrawal bleeding on the 21st of March. Had my last period on the 9th of March (irregular). Today is the 24th of April and no periods as of yet. No cramps or anything, just feeling very tired, this could be due to stress at work. I don't want to conceive. Am I pregnant?

If you don't WANT to get pregnant... why aren't you using actual birth control. Postinor used as you used it isn't a substitute for birth control.

No form of birth control is 100% effective.....and the morning after bill which isn't either. Its intended to be used when a condom fails....not as a substitute for birth control.

With that said...its certainly possible.....but it causes havoc with ones cycle (meaning your period is likely to be late from that alone) so its likely to take even longer before you know if anything is up or not.

Wait a few weeks after your period should have come and take a test.....if its negative take another in a week from then,

Pregnancy can only be diagnose with a urine test, a blood test, an ultrasound, or giving birth. There is no way to diagnose pregnancy online, no matter how much information you provide.

You'll have to wait, test, and see. That's all anyone can do.

Good luck.