Hilchot Nidda #42 - YD Tur/Bet Yosef Siman 196 Saifim 11-13 - Dec 28, 2023 - Halachot Nidda Shiur #42 - Yore Deah Tur Bet Yosef Siman 196

Or Letzion (Chelek 1 YD Siman 6) - Early ovulation, and only blead 3 days, what should they do to have kids? A few days before her nida, lie to her husband and say "I am Tameh" from 2 days before her nidda, so she can be considered tameh and count 5 days from then.

Rav Ben Haim disagrees