Halakhah for Niddah 62:4
אמר רבא
further stated: A woman conceives only immediately before her menstrual period, for it is said, Behold I was brought forth in iniquity;<span class="x" onmousemove="('comment',' Ps. LI, 7. The last word is taken as an allusion to the menstruation period when intercourse is an iniquity' and the prefixed beth ('in') is rendered 'near'. ');"><sup>3</sup></span>
Sefer HaChinukh
It is from the roots of the commandment [that it is] in order that she be aroused by action to give thanks to God, blessed be He, who saved her from the pangs of her birth, which is a miraculous thing. And also they, may their memory be blessed, said (Niddah 31b) that a woman rushes to swear at the time of her throes that she will no longer [have sexual relations with] a man. And therefore she requires atonement, and hence her sacrifice is called a sin-offering, and it is stated about her, "and the priest shall atone for her" (Leviticus 12:8).
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