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The chances are slim. However, if you'd feel more comfortable, you can take some pregnancy tests or see a doctor about it (many local hospitals and clinics have programs aimed at teenagers that make it cheaper or free, and it's confidential).

And in the future, it's probably a good idea to not have sex while drunk. Not only does it mean it's harder to think clearly and take the necessary steps in protecting yourself from STIs (those matter too, don't forget, even if both of you never had sex before, some infections can be acquired through non-sexual means and be passed on sexually) and pregnancy, but it can also be a problem when it comes to consent and respecting each other's boundaries fully.