Taking pills to prevent menses during Hajj or 'Umrah
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Question: Is it permissible for a woman to take (pills/medication) to prevent (the arrival of) her menses so she can perform the rites of the hajj or ‘umrah with ease?
I do not see any harm in (a woman) taking this medical treatment, with the condition that the doctor (in his/her professional opinion) does not see any harm for the woman in taking these pills. So, the (basic) principle in these things is permissibility, and (so long as) there is no falling into sin in this act.
Fataawa Muhimmah li-Nisaa. al-Ummah - Page 53