Wow, well, you only need one dose of the morning after pill for it to work. You didn't need to run out so fast to get it, as pregnancy wouldn't have had a chance to even think about happening for at least 7-24 hours. It takes sperm a LONG time to get to the Fallopian tubes, assuming there is an egg there to fertilize.
I would be more concerned with what multiple doses of such a drug in such a short period of time would do you to rather than whether you could still have a chance to be pregnant.
Maybe you should think about having a back up plan if getting pregnant freaks you out so much.
Call the doctor and see what damage three doses of the morning-after pill might do. I'm concerned about excessive bleeding or something else.