Charles Ellicott Commentary Leviticus 15:28

"But if she be cleansed of her issue, then she shall number to herself seven days, and after that she shall be clean." — Leviticus 15:28 (ASV)

But if she be cleansed. —That is, cured or healed of her infirmity. The expression “cleansed” is used both here and in Leviticus 15:13 for the disappearance of the ailment. From the time of its cessation she is to count seven days, during which no trace of the ailment must be observable, just as in the case of the less innocent disorder. (See Leviticus 15:13.)

After that she shall be clean. —That is, after having performed the rites of purification.