I got pregnant with the same mishap.....not to scare you. All contraceptives are never 100%.
she was due the 17th...this past sun. but as i said above She said thats shes always late every month and that shes fine.... I mean i assume that whatever would have ecscaped the sperm would have been killed by the spermicidal lubrication that comes on the condom given the maner it would have ecscaped (out of the base)
When was the incident and what date was her period due? I'd say the chances are extremely low given the above information.
If she's already late, I'd have her take a pregnancy test. But, it doesn't sound likely that she would have gotten pregnant. That's just my opinion. Best of luck to you.