Calculation of the Menstrual Day
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Question
A woman saw drops of blood at the beginning of her period, and after a few days, the actual period began. A month later, she does not remember on which day the actual period started. 1. What is the ruling regarding the initial days when it is uncertain if the period started? 2. What is the ruling regarding the days when it is clear that the period already occurred, but there is doubt whether it is exactly the day of the average cycle or the monthly cycle?
Answer
Hello,
If the drops of blood appeared as stains, whether they render impure or not [for example, less than a gris, on colored clothing, on an item that does not receive impurity], the period is considered only from the actual sighting.
If the drops were as a discharge from the body, such as during an examination or a focused wiping against the place, it should be calculated from the drops.
In the case of doubt about the day of the period, such as when it is unclear when it started, it should be calculated from the day there was a definite sighting. There is no need to be concerned about the uncertain days.
Source
Shulchan Aruch, Yoreh De'ah, Siman 190, Se'if 54; Siman 184, Se'if 4