Sahih Bukhari Volume 007, Book 068, Hadith Number 466.
Narrated By 'Aisha : Allah's Apostle entered upon me at Sarif while I was weeping (because I was afraid that I would not be able to perform the ,Hajj). He said, "What is wrong with you? Have you got your period?" I replied, "Yes." He said, "This is a matter Allah has decreed for all the daughters of Adam, so perform the ceremonies of the Hajj as the pilgrims do, but do not perform the Tawaf around the Ka'ba." Allah's Apostle slaughtered some cows as sacrifices on behalf of his wives.