Thanks for your question.
They are many tests done to diagnose gonorrhea. Basically these may culture test (which is the most common test) and non-culture alternative tests. Non-culture tests may be less accurate when there is blood or during menses. Therefore in these circumstances culture tests should be used. Therefore if your culture test was negative, then you don't need to worry about still having gonorrhea.
If you had not been diagnosed with gonorrhea any time in the past, and since you also took treatment with a negative test later, therefore it is highly unlikely that you are infected with gonorrhea.
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Yes that may be the cause.