Question:
If after a proper hefsek Tamara a woman miscalculated and was under the mindset that the seven days of counting will conclude on a Thursday night and discovers a few days later that it really ends on Wednesday night, a day earlier, does that represent a problem as far as the requirement of “counting seven days” or any other issues?
Answer:
No it doesn't present a problem at all, even if she didn't count the correct day. Counting he correct day of the seven clean days is only a preference.
Best wishes
