I really recommend Scarleteen - they have many answers to many questions. If you are having trouble with condoms breaking, the above link has some tips. It's not a common problem though.
I took the tests 4 to 5 months after we had sex and all of them came out negative
@matt2saccount In my experience, it makes a popping noise when it breaks. But that might not happen every time so the best way to know is to water test it when you're done