Ref. No. 41/975
In the name of Allah the most Gracious the most merciful
The answer to your question is as follows:
(i) Using menses control pills may harm a woman. Hence, it is better that she does not use the pills. Though using the pills is allowed due the severe needs as detailed in the question. Nevertheless, if a woman couldn’t take pills and menses started. Now the situation is that while she is still going through menses, the departure time has arrived and she is yet to perform Tawaf-e Ziyarat. In this case, the woman should wear sanitary pads and perform Tawafe Ziyarat. Along with this, she must also slaughter an animal, such as camel, in the Haram premises. However, she will not be obligated to sacrifice the animal if she becomes pure and is able to perform the tawaf in a condition of purity.
ولوطاف للزیارۃ جنبا او حائضا او نفساء کلہ او اکثر ہ و یقع معتدا بہ فی حق التحلل ویصیر عاصیا فان اعادہ سقطت عنہ البدنۃ (غنیۃ الناسک 272)
(ii) If the woman couldn’t do tawafe Wadaa and menses started then she should do nothing for it. She will not be required to offer any sacrifices etc.
وکذلک لیس علی الحائض والنفساء طواف الصدر ولاشیئ علیھا بترکہ (تاتارخانیۃ 2/522)۔ امر الناس ان یکون آخرعھدھم بالبیت الا انہ خفف عن المرآۃ الحائض (مسلم شریف 1/427)
And Allah knows best
Darul Uloom Waqf Deoband