よく考かんがえたら

expression

on second thought; come to think of it; actually

Used when reconsidering or realizing something after a moment of thought, often introducing a changed opinion or a new insight.

• よく考かんがえたら、彼かれの言いう通とおりかもしれない。

  Come to think of it, he might be right.

• よく考かんがえたら、今日きょうは休やすみだった。

  On second thought, today was a day off.