Praise be to Allah.
If a menstruating woman passes the meeqaat and intends to enter ihraam from the meeqaat, then when she reaches Makkah she should do all the actions of Hajj except for tawaaf around the House and saa’i between al-Safa and al-Marwah, which she should delay until she becomes pure. This is also what a woman should do if her period comes after she enters ihraam and before she does tawaaf.
But if her period comes after doing tawaaf, then she may do saa’i between al-Safa and al-Marwah even if she is menstruating.
The scholars of the Standing Committee were asked:
What is the ruling on a menstruating woman doing Hajj?
A menstruating woman is allowed to do Hajj. The one who enters ihraam has to do all the actions of Hajj, but she should not circumambulate the House until her period ends and she does ghusl. The same applies to women who are bleeding following childbirth. If they do all the essential parts of Hajj then their Hajj is valid.
Fataawa al-Lajnah al-Daa’imah li’l-Buhooth al-‘Ilmiyyah wa’l-Ifta’, 11/172-173.
Shaykh Muhammad ibn Saalih al-‘Uthaymeen said:
If a woman intends to do ‘umrah, it is not permissible for her to pass the meeqaat without entering ihraam, even if she is menstruating. So she should enter ihraam even if she is menstruating and her ihraam is valid. The evidence for that is the fact that Asma’ bint ‘Umays, the wife of Abu Bakr (may Allaah be pleased with them both) gave birth, when the Prophet (peace and blessings of Allaah be upon him) was camped at Dhu’l-Hulayfah on his way to perform the Farewell Pilgrimage. She sent word to the Prophet (peace and blessings of Allaah be upon him) asking him what she should do. He said: “Do ghusl and tie a piece of cloth around yourself and enter ihraam.”
The blood of menstruation is like the blood of nifaas. So we say to the menstruating woman: if she passes the meeqaat and she intends to do ‘Umrah or Hajj, we say to her: Do ghusl, tie a piece of cloth around yourself and enter ihraam. What is meant by tying a piece of cloth is placing a piece of cloth over the vagina and tying it in place, then entering ihraam whether for Hajj or ‘Umrah. But when she enters ihraam and reaches Makkah, she should not go to the Ka’bah or circumambulate it until she becomes pure. Hence the Prophet (peace and blessings of Allaah be upon him) said to ‘Aa’ishah, when she menstruated during ‘umrah: “Do everything that the pilgrims do, but do not circumambulate the House until you become pure.” This report was narrated by al-Bukhaari and Muslim. According to Saheeh al-Bukhaari ‘Aa’ishah stated that when she became pure she circumambulated the House and did saa’i between al-Safa and al-Marwah. This indicates that if a woman enters ihraam for Hajj or ‘Umrah when she is menstruating, or her period comes before she does tawaaf, then she should not do tawaaf or saa’i until she becomes pure and does ghusl. But if she did tawaaf when she was pure and after she finished tawaaf her period came, then she should continue and do saa’i even if she is menstruating, and she should cut her hair and end her ‘umrah, because tahaarah (purity) is not essential for saa’i between al-Safa and al-Marwah.
Sittoon Su’aalan fi’l-Hayd, question no. 54.
And Allaah knows best.