Maliks Muwatta Book 20, Hadith Number 236.

Yahya related to me from Malik from AbuRijal Muhammad ibn Abd ar-Rahman from Amra bint Abd ar-Rahman that when A’isha umm al-muminin was doing hajj with women who were expecting their periods, she would hurry them to do the tawaf al-ifada on the Day of Sacrifice. If they started to menstruate after the tawaf al-ifada she did not stop for them but left with them while they were menstruating.