This must refer to an unexpected occurrence. Intercourse during the acknowledged period was a heavy crime, and was to be punished by “cutting off” Leviticus 18:19; Leviticus 20:18; Ezekiel 18:6.
Related Commentaries of Leviticus 15:24
Leviticus 15:24
24 And if any man lie with her at all, and her flowers be upon him, he shall be unclean seven days; and all the bed whereon he lieth shall be unclean.