Siman 186 Seifim 3 - 5:
3. A woman who does not see fewer than 14 days after her last immersion and has no regular cycle after the 14th day is considered for the first 14 days as a woman with a vesses kavua.
4. A man can rely on a woman to check his eid - since she is believed about her own, she is believed about his.
5. If she saw blood as a result of intercourse 3 consecutive times, she may never have intercourse with her husband again, as will be explained in the next Siman.
What's going on?
Seif 3 establishes a new principle for us - the partial vesses kavua. This is known as the Vesses Trumas HaDeshen. In general, throughout hilchos niddah we do not hold of this opinion and it is used only for the purpose of the first 3 checks.
There is a view that the reason the Shulchan Aruch uses 14 days as his example is to tell us that the count should be from the end of the woman’s menstruation rather than from the beginning of it. While there are those who suggest that we observe separation based on both counts. The prevailing practice is not to worry about this alternative, since observing increases the likelihood of error.[1]
We should not rely on the first few acts of intercourse to determine the woman's status vis-a-vis her husband. Painful early intercourse can result in bleeding that has nothing to do with menstruation. Therefore, one is permitted to delay counting the 3 consecutive times until the woman is no longer in pain or at risk of bleeding from her initial intercourse.[2]
Seif 3 establishes another principle for us - that the 3 times must be counted during times when she is not classified as a kavua. Since she never bleeds in the first 14 days, we attach no special significance to her not bleeding during that time.
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[1] SSH 186:3(1)
[2] Shach 186:2