Well yes it is possible because some of the sperm might have escaped the condom whilst it was inside you. However, it's going to be a much smaller chance than if he had just come inside you without a condom so try not to worry too much - easier said than done I know!

When is your period due? You're too late for the morning after pill now; your best bet is to wait and see if your period comes and if it's late then do a test.

Good luck!