Your just gonna have to wait and see hun! Not much you can do now until test time! If your not pregnant, maybe try another method of birth control like the pill, depo or the patch.
As for the 13 y/o wow hun! I can't even imagine being in your position, I mean to be honest I was still being retarded and playing in the mc donalds play place with my girlfriends, going on my first 'date' to the movies or mall. I never had to deal with any of that stuff that you will have to deal with! Maybe you should read my post titled -early teens and unprotected sex.
I hope for your sake that your not pregnant and that you wise up about b/c before your childhood is over! I mean sweetie you are barely a teen! Don't you want to have a permit, drivers license, drive, go to prom, homecoming, pep-assemblies and all the fun during the teens before you have a child?? Just think carefully the next time you lay down to have sex with a guy!
Gl and bw
-jessika-