Stipulating a condition [about exiting ihram] in Hajj and ‘Umrah for one who is afraid that her menses may come

A woman wants to do 'Umrah but there is the possibility that her
period may come after she enters ihram and before she does tawaaf. Can
she stipulate a condition [about exiting ihram] because she is afraid
that she may hold her family up?.
Praise be to Allaah.
If a woman wants to do 'Umrah but is afraid her menses may come before
she completes it, she may stipulate a condition [about exiting ihram],
then if she gets her menses she can exit ihram and will not have to do
anything.
The basic principle about it being permissible to stipulate such a
condition is the report narrated by al-Bukhaari (5089) and Muslim
(1207) from 'Aa'ishah (may Allah be pleased with her) who said: The
Messenger of Allah (blessings and peace of Allah be upon him) entered
upon Dubaa'ah bint az-Zubayr and said to her: "Perhaps you want to
doHajj?" She said: By Allah, I am always in pain. He said to her: "Go
for Hajj but stipulate a conditionand say: O Allaah, I will exit ihram
from the point where You have prevented me (from continuing, if some
problem should arise)."
If a person is afraid of illness or if a woman fears that her menses
may come, she may stipulate this condition.
Shaykh Ibn 'Uthaymeen (may Allah have mercy on him) was asked: With
regard to stipulating a condition [about exiting ihram] in Hajj, are
there any specific cases in which the pilgrim shouldstipulate this
condition and say: "If something prevents me (from continuing), I will
exit ihram from the point where You have prevented me (from
continuing)"?
He replied: Stipulating a condition in Hajj means saying, when
entering ihram: "If something prevents me (from continuing), I will
exit ihram from the point where You have prevented me (from
continuing)."
Stipulating this condition is not prescribed unless there is some fear
of sickness, or if a woman fears that her menses may come, or if a
person is delayed and fears that he may miss Hajj. In these cases he
or she should stipulate this condition. If he stipulates this
condition and something happens that prevents him from completing the
rituals, then he may exit ihram and leave, and does not have to do
anything.
But if he is not afraid (of any of these things happening), the Sunnah
is not to stipulate a condition; rather he should be firm in his
resolve, put his trust in Allah and think positively of Allah, may He
be glorified and exalted.
End quote from Liqa' al-Baab al-Maftooh, 25/18
And Allah knows best.