let me get this straight?

-you had sex a week before your periode, and the condom broke.
-you got your period after the incident with the broken condom

You won't be pregnant. But if you are worried, go to a health clinic! call one of those 1-800 numbers for women in distress!

This isnt the time to be bashful that you're having sex. (I have no idea how old you are but I got the immpression you're in your teens) If you're old enough to have sex then you're old enough for the resposibilities that come with it. Education about these things are key.