We can't tell you for sure if you are pregnant, but I highly doubt you are. I believe that pill is supposed to make you start your period. And second you wouldn't have any signs of pregnancy so soon. I don't think you have anything to worry about.

i missed my period for march before i found out i was pregnant. I still went to a doctor just to ease my mind. so you should do that and i know how you feel im 16 to and when i found out i might be preggie I was freking out but i will help if you need it =]

well first off the emergency contraceptive pills can make your period come sooner than expected but only by a few days.... and the stomach pains are not good thats not supposed to happen..... what you need to do for sure is to see a doctor about that.... i cant tell you if your pregnant or not but there is a good website you can find out what you need to know about the ecp its:
http://www.cyh.com/HealthTopics/HealthTopi cDetails.aspx?p=240&np=299&id=2052 #6
i hope everything works out for the best
good luck!

About those stomaqch pains the person im quoteing is right. I never got atomach pains it could just be that your nervous.