Musannaf Ibn Abi Shaybah

Hazrat Ata was asked that if a woman gets her menses in the early part of the day during Ramadan, what should she do? He replied that she should start eating and drinking.

Hasan says that if a woman gets her period after the sun has turned yellow in Ramadan, her fast is broken. If she was menstruating, but became pure after the break of dawn, then she should not eat or drink for the rest of the day.

Hazrat Aamir says that if a woman begins the day in a state of purity while fasting, then she gets her period, she may eat.

Ibrahim says that if a woman becomes pure during the day in Ramadan, then to avoid resembling the polytheists, she should not eat anything until night.