[darthvader8]

I had unprotected sex on the 9th of September and took the morning after pill the next day. I think it was within 24 hours. My periods were due on 18th and I got them perfect. Except they lasted 5 days. Usually they last 7 days. But it was not spotting, it was normal menstruation. And my periods are regular.
Its been 10 days now, and I still haven't got my periods.
Could I be pregnant?
Now, the confusing part for me is... If I got my periods properly after taking the morning after pill, I should not be pregnant. Then why is there such a delay this month?

PS: I don't want to be pregnant right now!

[DoulaLC]

While the morning after pill is highly effective, it isn't 100% effective. It can also sometimes cause cycles to be off.

You could try a pregnancy test; following the directions carefully, or you could give it some more time and see if your period is just late or skips this month.

[Fr_Chuck]

First if you don't want to be pregnant, don't have sex, or at least use a couple forms of birth control when you do.

Next I am surprised you periods are even close right now, they are normally off track for at least a couple of month after you take the pill