What's Going On - Mistakes Seif 12 deals with possible errors in counting. The Shulchan Aruch only considers the case of miscounting the 7 clean days by one day (this does not apply to a miscount of the initial 5 days) and not more because the likelihood of a miscount greater than a day is fairly small. However, if it were to happen, it would be treated in the same way. The interruption created by a poletes is not the same as that created by an additional flow of blood. As we have learned, a flow of blood cancels the count of clean days altogether while a semenal flow only results in nullification of the specific day on which it occurs. Based on this, the ruling of the Shulchan Aruch makes sense - we have her wait the standard 72 hour period, with these days considered as interruptions of the count and not cancellations, and then count one more clean day. The Shach (13) notes that she does not need to add on the extra day that Ashkenazim do at the beginning of menstruation. Additionally, the woman does not need to perform a hefsek tahara, but still needs to perform the twice daily self-examination. The Pischei Tshuvah notes a case in which a woman had a stain on Day 1 of the 7, restarted her count and then was led to believe that might have counted 6 new days rather than 7. In that particular case the woman did not require a new immersion, based on a combination of factors. First, she is doubt about the count and may or may not have counted 7 days and second, the prohibition of staining is Rabbinic, thus falling into the category of Safek d'Rabbanan l'Kula - in case of doubt in the application of a rabbinic law, we tend to the lenient position.
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