Thanks for the query.
The chance of pregnancy
is less in your case because:
He didn't ejaculated in to the vagina.
You used emergency pill within time.
As emergency pill can alter the menstrual cycle, if you took the pill in the second half of your cycle your periods may get delayed.
For more details:http://srsree.blogspot.in/2012/08/emergency-contraceptive-pill-short-term.html
If you do not get periods even one week after your expected date better to go for pregnancy test once.