Uterine bleeding makes a woman niddah, even if she is in menopause. The laws for becoming tehorah are the same for menopausal and other women, including a five-day wait followed by seven clean days. (For information about the reasoning behind the five-day wait, please see our site's article "The Five Day Minimum.")

Halacha does apply different rules to menopausal women regarding vesatot. If you have gone over ninety days without becoming niddah, you are exempt from observing vesatot. You will not have to halachically anticipate becoming niddah again once you immerse in the mikveh.

(The exceptions would be if you were to have the same interval three times in a row, thus setting a fixed veset for interval, or if you were to become niddah at intervals shorter than ninety days three times in a row.)

If this episode of bleeding came after a year or more without uterine bleeding, you should also consult your physician.

Please write back with any further questions.