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1. The Gemara discusses when a woman must suspect that she is a Zavah due to a large bloodstain on her clothing.
2. Rebbi says that both opinions (see #1) are correct in different cases.
3. Rava explains Rebbi's understanding of the Beraisa.
4. Even if a woman became Tamei through seeing a bloodstain on her clothing, she must purify herself in the way of a Nidah.
5. The Mishnah discusses the case of a woman who sees Dam between days of different statuses.
A BIT MORE
1. Tana Kama: If there is a spot large enough to split into three spots, each slightly larger than a Gris, she must suspect that she is a Zavah. Rebbi Yehudah: Even if the spot is large enough only for two Gris, she must suspect that she is a Zavah.
2. The Tana Kama is correct when she checked herself. Rebbi Yehudah is correct when she did not (see #3 below).
3. The woman checked herself during Bein ha'Shemashos of the second day, but she did not check her clothing until the third day. The Rabanan maintain that if she checked the entire Bein ha'Shemashos of the second day, it is simply impossible for her to have become a Zavah by seeing a spot during Bein ha'Shemashos that can count for two days. Rebbi Yehudah is referring to a case in which she did not actually check herself during the entire Bein ha'Shemashos.
4. In other words, she must check herself to make sure that she is Tahor before she is allowed to immerse at the end of her Nidah days. (Nowadays, when we suspect that every Nidah is a Zavah, she must check to ascertain that she is Tahor before she is allowed to start counting her seven clean days.)
5. For example, a woman who sees on the 11th day of her Zivah days during Bein ha'Shemashos might be at the end of her Zivah days or at the beginning of her Nidah days. She must suspect that this is the beginning of the 12th day (in case it is considered night) and it is the beginning of her Nidah days, and she must suspect that it is the end of the 11th day (in case it is considered daytime), and it is a Zivah emission.
Next Daf Index to Revach for Maseches Nidah