Laws of Menstrual Cycles
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Question
A woman with a fixed menstrual cycle, should she be concerned about the average cycle? And should she strictly adhere to the opinion of the Shach and the Plati that it is on the 31st day?
Answer
Shalom Rav,
A. If the menstrual cycle is more than 30 days, she does not need to be concerned about the average cycle. If it is less than 30 days and the cycle has passed without menstruation, she should be concerned about the average cycle.
B. It is also necessary to consider the 31st day, which is the main average cycle according to the opinion of the Shach.