Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.118B.

For women it is desirable to perform Tawaf Al-Ifadah early on the Day of Nahr, if they fear they will begin to menstruate. ‘Aishah used to order the women (pilgrims) to perform it on the Day of Nahr – 10th of Zhul-Hijjah, as a precaution against the menses.

‘Ata said, “If a woman (pilgrim) is afraid of her monthly period, she may perform the Tawaf of Ka’bah before throwing the pebbles at Jamarah Al-Aqabah, and even before her sacrificial animal is slaughtered.

There is no harm in a woman pilgrim using any medicine to delay her periods so as to perform this Tawaf. Sa’id bin Mansur reported that Ibn ‘Umar was asked about a woman that takes some medicine to delay her periods. At this he said he saw no harm in it, and told them to use water of Arak instead.

Mohibbuddin Al-Tabri said, “If it can be delayed in this case then it can also be delayed in (determining) the period of ‘iddah, and all other situations. On the same principle, medicines may be used to induce monthly periods.