It is permissible for a woman to take something to prevent her period so she can do Hajj
Question

                Is it permissible for a woman to take pills to stop her monthly period so that she will be able to do Hajj with the people?.
Praise be to Allah.There is nothing wrong with a woman taking contraceptive pills to prevent her period during 
    Ramadaan so that she can fast with the people, and during the days of Hajj so that she can do tawaaf with the people and not miss out on any of 
    the actions of Hajj. If she can find something other than the pill to stop her period, there is nothing wrong with that so long as it is not 
    haraam according to sharee’ah and is not harmful.”