Sorry I keep asking the same question, but I might do it again.
I don't mean to keep asking you the same question over and over. I might let it slip again though.
この場合、次のような言い方ができますよ。
ーSorry I keep asking the same question, but I might do it again.
「同じ質問ばかりしてすみません。でも、また(同じ)質問するかもしれません」
ーI don't mean to keep asking you the same question over and over. I might let it slip again though.
「何度も同じ質問をするつもりはないんですが、またしちゃうかもしれません」
ご参考まで!