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You mean that you recall yourself saying so?
I agree that it is grammatically correct.
I may even say something like that myself in a situation (a too common one for me, too) when I begin a...

Я немного говорю по-русски sounds a bit more natural to me. but the others are correct too. Я говорю только немного по-русски sounds a bit weird, a native speaker would not normally say something...