Edit: "She was my first sexual partner..." was and still is :)
She was my first sexual partner but I did do an HIV and Hep C test in April just to assure her. Nursegirl sorry for asking another question, but have you heard of the rapid care test? (Not trying to insult your intelligence, just merely curious)
Her test results were conclusive, you have nothing to worry about. 3 months is the current recommended window period, and even that is ultra conservative. There would never be a need to test after 3 months, unless a person was severely immunocompromised (chemo, terminal cancer, etc).
If the clinic had any doubt about the accuracy of the results, they would have recommended re-testing. Trust in and believe her results.
Did YOU test along with her? After all, it is only fair for both parties to be tested when entering a monogamous relationship.