Reference for Ketubot 4:1

דלא מציא אמרה ליה נסתחפה שדהו כי תיבעי לך שלא בשעת ווסתה מאי כיון דלא בשעת ווסתה הויא מציא אמרה ליה נסתחפה שדהו או דלמא כיון דאיכא נשי דקא משנייא ווסתייהו כשעת ווסתה דמי

During her regular time there is no question that she cannot say to him, “His field has been flooded. When is the question asked? Not during her regular time, what is [the law]? Since it is not during her regular time, she can say to him, “His field has been flooded”? Or, perhaps, since there are women who change their periods, it is as if it was her regular time?

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