Most likely you are not pregnant, but a week on BC pill is not a sure fire thing.
If you don't get your period, I would take a pregnancy test. Even when the pill has been used for months there is still a 2% chance of getting pregnant so if you miss a period you need to take a test.
Hello there -
You mentioned that you had been on the pill for a week when you had the condom 'accident.' Honestly, you shouldn't worry. As far as being late for your period, that could simply be due to the birth control pills that you're body isn't used to as yet. Also, the brown discharge is just one of those things and I wouldn't let it trouble you. You are going to be fine, wait and see! Take care ...